All Lost Cargo Rewards in Junkster (UM-13 Quest Guide)

The lost cargo rewards in Junkster culminate in unlocking the Aethelburg Vault, a secret endgame bunker filled with unique gear, but the journey to get there provides a steady stream of powerful schematics, a high-damage rifle, and a useful companion bot. This long-form quest, officially titled "Stork's Burden," is one of the most substantial side activities in the game, and completing it is essential for players wanting to see the true ending.

This guide covers every single reward from the seven Secure Data Caches scattered across The Heap, detailing what you get, where to find it, and why it’s worth the considerable effort.

01

What Are the UM-13 Lost Cargo Rewards?tag

The quest revolves around finding seven Secure Data Caches from the crashed freighter UM-13 "Stork." While the ultimate prize is the key to a hidden vault, you are rewarded for every single cache you recover for Silas. The rewards are a mix of unique schematics for crafting, caches of rare components, two major milestone items, and the final key itself. The most important rewards are the 'Scrapper's Gambit' rifle and 'Widget' the pack-bot, which significantly change how you can approach combat and exploration.

Here is a complete breakdown of every reward you'll earn in order:

02

How to Start the "Stork's Burden" Questtag

You can't begin hunting for the lost cargo until you progress the main story to the point where you reach the Rust-Eater's Camp in the southern part of the Grit Canyons. This is typically accessible after you've dealt with the Scrap-Baron Volt.

Inside the main hub of the camp, look for an old scavenger named Silas working at a cluttered tech bench. He's recognizable by his prosthetic eye that glows a faint amber. Speak to him, and he'll tell you the story of the UM-13 "Stork," a pre-Collapse cargo hauler that went down somewhere in The Heap. He believes its cargo contains invaluable tech and data.

Accepting his proposal begins the "Stork's Burden" quest. Silas will give you a key item essential for this mission: the Spectrum Analyzer. When equipped in a gadget slot, this device will emit a rhythmic pinging sound that gets faster and higher in pitch as you get closer to one of the hidden Data Caches. It also adds a signal strength indicator to your HUD, making the hunt manageable.

03

All 7 Lost Cargo Cache Locations and Rewardstag

Each of the seven caches is hidden in a distinct, often dangerous, part of the world. You'll need the Spectrum Analyzer equipped to locate their precise position, which is usually a small, half-buried cargo pod that you must pry open.

Cache 1: The Corroded Spiretag

• Location: Found at the very top of the tallest radio tower in the Rusted Needle Fields. The climb is a platforming challenge, and you'll need to watch out for territorial Shriek-bats.
• Reward: Schematic: 'Static-Knit' Cloak. This is an excellent early-game chest piece that grants resistance to electrical damage and slightly muffles your footsteps, making stealth approaches easier.

Cache 2: Sunken Hydroponics Baytag

• Location: This cache is underwater inside the flooded central dome of the abandoned Oasis Hydroponics facility. You'll need the Rebreather mod for your suit to survive long enough to find it. It's wedged between two giant, non-functional water purifiers.
• Reward: Schematic: 'Volt-Jolt' Gauntlet. A powerful unarmed weapon mod that adds a chance to stun enemies with electrical discharge on a critical hit. A must-have for melee builds.

Cache 3: Assembly Line Graveyardtag

• Location: Deep within the abandoned Corvega auto-plant, in the final assembly chamber. The cache is inside the chassis of an unfinished vehicle on the main conveyor belt. This area is heavily guarded by rogue Scrap-Golems.
• Reward: Component Cache & The 'Scrapper's Gambit' Rifle. After you turn in this third cache, Silas will reward you with this unique weapon. It's a powerful single-shot rifle that does more damage the more scrap you are carrying (up to a cap). It's a high-risk, high-reward weapon that can one-shot many mid-tier enemies if you're hauling a full load of junk.

Cache 4: Glitch-Hound Warrentag

• Location: Hidden in the back of a cave system in the Howling Peaks. The warren is a maze, and as the name suggests, it's infested with feral Glitch-Hounds that can teleport short distances. The cache is tucked away behind a large cluster of glowing crystals in the main nesting chamber.
• Reward: Schematic: 'Echo-Visor' Helmet. This helmet allows you to see enemies through walls for a short period after you perform a stealth takedown. It's an incredibly powerful tool for clearing out camps and facilities without raising an alarm.

Cache 5: The Whispering Comms Towertag

• Location: Not to be confused with the Corroded Spire, this is a smaller, more modern comms tower on the edge of the Static Fields. The cache is on an external maintenance platform about halfway up. The challenge here is the constant energy storms that will damage you if you're not under cover.
• Reward: Component Cache & 'Widget' the Pack-Bot Companion. Your fifth delivery to Silas will net you a deactivated companion bot. After a short repair sequence, Widget will follow you, providing extra inventory space and occasionally finding extra components when you're looting. Widget cannot fight, but its utility is invaluable for long scavenging runs.

Cache 6: The Overgrown Interstatetag

• Location: On the I-90 overpass that has collapsed into the Grand Mire. You'll need to navigate the treacherous wreckage, avoiding pockets of radiation. The cache is inside a locked trailer; the key is on a corpse dangling from the bridge's support structure below.
• Reward: Schematic: 'Kinetic-Coil' Boots. These boots store kinetic energy as you sprint. After a full sprint, your first melee attack will do significantly more damage and have a high chance of knocking the enemy down.

Cache 7: The Meteor Crater Observatorytag

• Location: The final cache is at the most remote location: the ruins of the Polaris Observatory, which sits on the rim of a massive crater. The area is low-gravity, affecting physics and movement. The cache is located in the damaged control room of the main telescope, guarded by a unique, powerful variant of a Sentry Bot.
• Reward: The Aethelburg Decryption Key. This strange, multifaceted key is the last piece of the puzzle. It has no immediate use, but returning it to Silas will reveal its true purpose.

04

The Final Prize: Unlocking the Aethelburg Vaulttag

Once you deliver the seventh cache and the Decryption Key to Silas, he'll finally piece together the coordinates and purpose of the cargo. The data points to the location of the Aethelburg Vault, a sealed, pre-Collapse bunker designed to withstand any cataclysm. He marks its location on your map—a nondescript cliff face in the Titan's Jaw region.

Using the key on a hidden console opens the massive blast door, giving you access to the pristine interior. Inside, you will find:

• The 'Aegis Protocol' Armor Set: A full set of high-end power armor that provides exceptional damage resistance and immunity to radiation.
• A Terminal with Pre-Collapse Lore: This terminal contains logs detailing the purpose of the vault and the final days before the world fell, providing significant world-building and context.
• The "New Dawn" Ending Trigger: Looting the primary cache inside the vault flags your save file. If you then complete the main story, you will get a special, more hopeful secret ending that directly references your discovery in the vault.

05

Frequently Asked Questions (FAQ)tag

Can you miss any of the lost cargo rewards? No. The caches are not tied to any specific main story moment and can be collected at any time after you receive the Spectrum Analyzer. You cannot be locked out of finding them.

Is the 'Scrapper's Gambit' rifle any good? Yes, it's one of the best sniper-style rifles in the mid-game, but its unique perk requires a change in playstyle. You have to get used to carrying around large amounts of junk to maximize its damage, which can be a liability if you're not careful about inventory management.

Does finding the lost cargo change the main story? It does not change the main plot quests, but finding the Aethelburg Vault and its contents does unlock a different final cutscene after you defeat the final boss. This is often referred to as the game's "true" or "best" ending.

Do I have to turn in each cache to Silas one by one? No, you can collect all seven Data Caches and turn them all in at once. However, you will not receive the milestone rewards (the rifle and the companion bot) until you physically speak to Silas after finding the 3rd and 5th caches, respectively. It's more efficient to return to him after those specific finds.

The Final Haultag

The "Stork's Burden" quest is a perfect example of what makes exploring The Heap so compelling. It's a long, challenging scavenger hunt that rewards your persistence at every step. While the individual schematics are great, the real prizes—a unique weapon, a loyal robot mule, and an entire suit of endgame armor—make this one of the most profitable and satisfying side quests in all of Junkster.