Resuggestion to include all relevant sales.

Links work weird. Sometimes if you open them, semicolon is added in the end which breaks the range. They should be clean now but, please, manually copypaste them into search bar to guarantee avoidance of this.

Item 1

->15919160760

Buyer: https://next.backpack.tf/profiles/76561198246096512/compare?from=1748563200&to=1752278400 -- can't trace keys, also huge history gap

Seller: https://next.backpack.tf/profiles/76561198313018251/compare?from=1752105600&to=1752192000 -- can't trace keys

->15925484551

Buyer: https://next.backpack.tf/profiles/76561199059800460/compare?from=1752192000&to=1752278400 -- untrace, might have received keys from another quicksell.store's bot but, history gap won't let me find out

Seller: https://next.backpack.tf/profiles/76561198246096512/compare?from=1752278400&to=1752451200 -- untrace

->15997637946

Buyer: https://next.backpack.tf/profiles/76561198095197492/compare?from=1754006400&to=1754092800

• 15994922821: 42 keys
• 15994999104: 1 keys
• 15976129025: 1 keys
• 15958161126-15958161912: 7 ref
• 15955268772-15955269540: 7 ref

Seller:

https://next.backpack.tf/profiles/76561199059800460/compare?from=1754006400&to=1754092800 -- untrace, too many sales

Snapshot before sale:

https://next.backpack.tf/classifieds/snapshots/Cloud%209%20Well-Rounded%20Rifleman/688dc7b5ba87f7ff640c55b0 -- item is listed for 45 shortly before the sale

Assuming 44 keys 14 ref

Item 2

->15825338310:

Seller: https://next.backpack.tf/profiles/76561198419405706/compare?from=1747526400&to=1749340800 -- untrace, huge gap in history, sale maybe not eligeable due to age

->15890063433:

mannco, unusable

Item 3

->15960217317

Possibly marketplace.tf sale on 23.06.25 @ $85 / $1.94 = 43.8144329897 keys

->15961934520

Buyer: https://next.backpack.tf/profiles/76561198053811988/compare?from=1751414400&to=1753315200 -- redumped to the next owner the same day

Seller: https://next.backpack.tf/profiles/76561199004803157/compare?from=1753228800&to=1753315200 -- untrace

->15961948307

Buyer: https://next.backpack.tf/profiles/76561199202119133/compare?from=1753142400&to=1753228800

• 15951766993-15951767377: 44 keys 

Seller: https://next.backpack.tf/profiles/76561198053811988/compare?from=1753228800&to=1753315200

• 15961947983-15961948299: 44 keys 21 ref

->15963241127

Buyer: https://next.backpack.tf/profiles/76561199405785454/compare?from=1753142400&to=1753315200 -- keys are untraceable

Seller: https://next.backpack.tf/profiles/76561199202119133/compare?from=1753228800&to=1753315200 -- keys are untraceable

->15999048803

Buyer: https://next.backpack.tf/profiles/76561198062747535/compare?from=1753574400&to=1753660800 -- keys are untracable

Seller: https://next.backpack.tf/profiles/76561199405785454/compare?from=1753488000&to=1753574400 -- keys are untracable

Item 4

->15940573841

Seller: https://next.backpack.tf/profiles/76561198316071886/compare?from=1752364800&to=1752624000 -- gap in history, untrace

Buyer: https://next.backpack.tf/profiles/76561198349848918/compare?from=1752624000&to=1752710400 -- untrace

• 15939036697-15939037167 and 15938389234-15938389837 have some keys from seller but, more then the hat would have gone for

Snapshot: https://next.backpack.tf/classifieds/snapshots/Cloud%209%20Well-Rounded%20Rifleman/68782ba194531adb7908cb25 -- seller's b/o @ 48.33 keys

Item 5

https://backpack.tf/item/9241669332

->15945252980

Buyer: https://next.backpack.tf/profiles/76561199102777012/compare?from=1752710400&to=1752796800 -- keys are untraceable

Seller: https://next.backpack.tf/profiles/76561198199284954/compare?from=1750377600&to=1752710400 -- gods know when it even entered inventory

Snapshot: https://next.backpack.tf/classifieds/snapshots/Cloud%209%20Well-Rounded%20Rifleman/687a862cdb93ab5c4b06ffac -- seller's b/o @ 48.31 keys

Item 6

Buyer: https://next.backpack.tf/profiles/76561198117799729/compare?from=1754265600&to=1754352000

• https://ibb.co/nMdVJ2r5
• https://ibb.co/x9Nmxsh

Seller: https://next.backpack.tf/profiles/76561198311498888/compare?from=1754265600&to=1754438400 -- untrace

44 keys 52.44 ref

Consolidating

44 keys 14 ref; 43.8144329897 keys; 44 keys 21 ref

(44 + 43.8144329897 + 44 + 44)keys + (21 + 14 + 52.44)ref = 131.8144329897 keys + 86.44 ref

(175.8144329897 keys + 86.44 ref) / 4 = 43.95360825 keys + 21.66 ref ~ 44 keys

A minor correction. In "Item 1" section replace ->15919160760 with ->15925371000. 15919160760 corresponds to the seller, not buyer.

In "Consolidating" section forgot to list item 6's sale in the first line so, it should be: 44 keys 14 ref; 43.8144329897 keys; 44 keys 21 ref; 44 keys 52.44 ref. It is included in calculations, though so, nothing critical.

Another one

https://backpack.tf/item/13317455782

untrace

https://backpack.tf/profiles/76561199120201440#!/compare/1753660800/1754438400

https://backpack.tf/profiles/76561199098607786#!/compare/1753574400/1753747200

untrace

https://backpack.tf/profiles/76561199084784906#!/compare/1753488000/1753574400

https://backpack.tf/profiles/76561199120201440#!/compare/1752451200/1753660800