Storage Hunters: Open World Mutations
Multiplier tiers from Dirty through Secret, stacks that add at the shop counter, reverse calculator, and best items to chase rolls on.
By Bloxron Editorial Team · Last updated
How mutations work
Mutations are sell-price rolls on graded loot — Void, Gold, Dirty, and the rest. They add at the shop counter, not in the auction preview. Silver (2×) and Gold (4×) on the same piece pay 6× total (2 + 4), not 8×. A Cheeseburger at $0.10 base with Void (35×) pays about $3.50; the same Void on Gangster Dominus ($15,000) pays $525,000. Run the stack in the calculator before you bid.
Mutation roster
Full mutation list sorted by multiplier. Pure spans about 1.5×–2×; Rainbow is still unknown; Black is unobtainable and excluded from calculators.
| Mutation | Multiplier | Visual | Status |
|---|---|---|---|
| Secret | 50× | Red-brown monospace styling | Listed |
| Void | 35× | Void purple-on-black gradient | Listed |
| Hologram | 15× | Glowing cyan hologram treatment | Listed |
| Chrome | 12× | Mirror-bright chrome finish | Listed |
| Timeless | 12× | Permanent glowing gold treatment | Listed |
| Gem | 10× | Pink-red gem palette | Listed |
| Diamond | 8× | Crystalline diamond surface | Listed |
| Corrupted | 6× | Corrupted green-on-black neon | Listed |
| Shocked | 6× | Electric yellow-orange crackle | Listed |
| Wet | 6× | Watery cyan-blue sheen | Listed |
| Ancient | 5× | Aged olive-teal patina | Listed |
| Firefly | 5× | Soft firefly glow | Listed |
| Gold | 4× | Distinct golden shelf treatment | Listed |
| Spotless | 3× | Pristine cosmetic condition | Listed |
| Antique | 2× | Aged antique styling | Listed |
| Huge | 2× | Oversized bold display | Listed |
| Silver | 2× | Silver metallic finish | Listed |
| Tiny | 2× | Shrunken display size | Listed |
| Moonlit | 1.5× | Dark-purple moonlit tint | Listed |
| Pure | 1.5× | Clean untouched locker look | Listed |
| Cobwebbed | 1.2× | Cobweb overlay on long-stored loot | Listed |
| Dirty | 0.8× | Grimy locker residue | Listed |
| Black | Unobtainable | Dark unobtainable treatment | Unobtainable |
| Rainbow | ? | Full rainbow gradient | Unknown |
How stacks add
Multiple mutations on one item add into one combined multiplier at sell time. Silver (2×) plus Gold (4×) is 6× total — not 8×. When picking a Gavel Trophy, compare how many multiplier points it adds to your stack — not just the shelf flash. Try stacks in the calculator and read the auction page for max-bid tips.
| Example | Math | Shelf payout | Note |
|---|---|---|---|
| Silver + Gold | 2× + 4× = 6× | $1,000 base → $6,000 shelf | Not 8× — multipliers add. |
| Scrap Dominus + Void | 35× on $565 base | $19,775 | High-base accessory example. |
| Scrap Dominus + Void + Gold | 35× + 4× = 39× | $22,035 | Still additive — not 35 × 4. |
| Gangster Dominus + Secret | 50× on $15,000 base | $750,000 | Why base price beats proc color. |
| Dirty + Pure | 0.8× + 1.5× = 2.3× | Penalty offset by second proc | Check the full stack before listing. |
Guess an unknown roll
Know the sell price but not the mutation? Enter sell price (p), the item's 100% max from Collection or the items page (m), and condition (c). Works best with only one mutation on the piece.
Exact shelf price with one unknown mutation
100% value from Collection or wiki
Current condition percentage
Works best on items with a single mutation. The pre-filled Dirty Pressure Cooker example (p 120.78, m 160, c 92) should read about 0.8× — matching Dirty.
Sell price math
The game applies the mutation multiplier before the condition curve. Values over $1,000 hit a 60% cap, so the reverse tool checks both uncapped and capped paths and picks the better fit.
Base sell (before mutation) uses this curve — V as final sell value, C as condition (0–100), and Vmax as the base value from Collection:
V = Vmax × (0.85 + 0.00035×Vmax − |0.35 − 0.00035×Vmax|²) + [Vmax − Vmax × (curve term)] × (C ÷ 100)
To reverse a single mutation multiplier M from shelf price P:
Uncapped (U):
U = −(0.25 + 0.75×C/100)
+ √[(0.25 + 0.75×C/100)² + 0.0014×(1−C/100)×P / (0.0007×(1−C/100)×Vmax)]
Capped (Cₘ):
Cₘ = P / (Vmax × (0.60 + 0.40 × C/100))
Unified:
M = (U + Cₘ + |U − Cₘ|) ÷ 2The calculator above uses this — usually close enough to narrow down the roll.
Chase targets
Secret commonly lists at 50× — treat top procs as windfalls, not planned drops, and re-check the sell screen if another table shows Secret as unknown. Void (35×), Hologram (15×), Chrome and Timeless (12× each), and Gem (10×) are the next-best single rolls. Diamond, Corrupted, Shocked, and Wet (6×–8×) work well as stacking partners on high-base machinery and accessories. Top multipliers on floor loot still pay pocket change — bid where base prices are high, especially Shipyard industrial pieces, Power Plant lockers, and Exclusive wearables.
How mutations roll
Mutations land on items from won lockers. The roll system is area-agnostic — the same roster can proc in Junk Yard through Lucky Bay (and on the Power Plant island). What changes by yard is base price: a Hologram (15×) on Shipyard machinery pays far more than the same proc on starter clutter. Practical chasing is volume plus targeting — bid where bases are high, especially accessory exclusives and industrial loot from the areas page.
Common mistakes
Assuming multipliers multiply instead of add. Selling Dirty items without checking for a second proc. Chasing Void on Junk Yard floor loot instead of high-base targets. Using the reverse calculator on items with multiple mutations. Skipping the calculator during a live bid war when additive math is not automatic.
FAQ
How many mutations are in the game?
The roster covers every known sell modifier from Dirty (0.8×) through Secret. Rainbow stays unknown; Black is unobtainable and excluded from calculators.
Do mutation multipliers add or multiply when stacked?
They add. Silver (2×) plus Gold (4×) pays at 6× combined, not 8×. Void (35×) plus Diamond (8×) totals 43× — not 280×.
Which mutation has the highest multiplier?
Secret commonly lists at 50× — still confirm the sell screen if a table elsewhere shows “?”. Void follows at 35×; Hologram is next at 15×; Chrome and Timeless tie at 12×. Rainbow appears in the roster but its multiplier is still unsettled — do not plan bids on a hard Rainbow number.
What does Dirty do?
Dirty is the only negative modifier at 0.8× — it sells below base. Never quick-sell a Dirty item without checking for a second proc; one positive mutation on the same piece cancels the penalty under additive stacking.
How do I identify an unknown mutation?
Use the mutation multiplier calculator on this page. Enter your exact sell price (p), the item's 100% base max from Collection (m), and current condition (c). It works best when the item has only one mutation — the Dirty Pressure Cooker example pre-fills to about 0.8×.
What is Relative Added Value Boost?
When choosing a Gavel Trophy, compare how many multiplier points it adds to your stack — not just the shelf number. +4× Gold on a $565 base beats +2× Silver in dollars, but it depends on what is already stacked.
Where should I chase high multipliers?
On the highest-base loot you can afford — Shipyard machinery and exclusive accessories, not Junk Yard clutter. Void on a $0.10 item is pocket change; Void on Scrap Dominus ($565) pays about $19,775.
When do mutations apply?
At sell time when a customer buys the listed item. Auction previews show base values only. Grading changes base before the multiplier applies; Lucky Grading gamepass and mutations stack independently.
Is there a calculator for mutation stacks?
Yes — the sell-value calculator loads priced item bases and known multipliers so you can preview shelf payout before you chase rolls at auction. This page also includes a reverse calculator to guess an unknown single mutation from sell price.