Quick answer

The Underground Exchange exchanges goods left in the trash through the janitorial service. Unlock access first, match the current directive, and check the return the next morning.

Checked 31 October 2026. Recipes follow community code references for Steam build 26274380; the official 1.0.0.5 reward fix is included.
Probably Stolen Underground Exchange: how trades work · Game item reference
Game item referenceImage source ↗

Confirm access before leaving anything in the bin

Sawyer's introduction, Exchange access and the cleaning service are related but separate checks. Community references describe delivery through the janitor, rather than a sale at your shop counter. Read the directive in your own save before choosing a trade.

Treat the bin as a place to surrender goods. Remove unrelated valuables before arranging the service; it is not a safe storage shelf.

References: 2

Complete one clear trade first

  1. Choose one offer shown on the current directive. A listed promotion must actually be active.
  2. Check every required item and its condition. Quantities refer to matching item objects, not automatically to ammunition rounds inside an object.
  3. Place only those inputs in the bin and arrange the janitorial service.
  4. Check the morning return before adding another batch. Record the consumed inputs if the reward differs from your expectation.
References: 1

Three recipes to recognize

These examples are versioned references, not a substitute for the condition text in your current directive. The documented limit is one use of each offer per night.

InputsReturn
3 Water Filters1 new Water Filter
2 modules1 random module
1 Smuggler's Bay + 8 Oxymore Injectors1 Modified Smuggler's Bay
References: 1

Troubleshoot the missing result in order

First check access and service, then exact inputs, then the active promotion and nightly limit. Change one condition at a time so the next attempt answers a specific question.

Also check your patch: official 1.0.0.5 fixed a delivered Modified Smuggler's Bay being discarded if left overnight. Collect your return promptly, especially when comparing an older save with a guide.

References: 213

Questions & answers

Will a random module trade improve my loadout?

The reward is random, so do not value it as a guaranteed upgrade. Compare the usefulness of both surrendered modules before committing them.

References: 1

Can I submit several copies of the same recipe tonight?

The referenced build limits each offer to once per night. Start with one complete set and check your directive before supplying extras.

References: 1

Sources & version notes

Source titles are kept in their original language.

  1. GameWikiStation — Black Market & Underground Exchange ↗Community · Checked 2026-10-31
  2. Nico's workshop — Sawyer ↗Community · Checked 2026-10-31
  3. Questing Goose Studio — Hotfix & Bell Hotkey Rebind, 1.0.0.5 ↗Official · Checked 2026-10-31