Resuggestion of https://backpack.tf/suggestion/5fc791f926068a1a6f5e742c per the rules that "all unusuals above 10 keys [must be] round to the nearest whole key".

Marketplace.tf sales

October 17: $42.22: $42.22 / $1.87 = 22.58 keys --- might be https://backpack.tf/item/8166460600 (has no other usable sales)

November 25: $40: $40 / $1.76 = 22.73 keys --- https://backpack.tf/item/8338501771

November 26: $40: $40 / $1.75 = 22.86 keys --- https://backpack.tf/item/5366203164 (has no other usable sales)

Sale 1

https://backpack.tf/item/8331549572

Scrapprehensive > unbxrn

Untraceable. Likely just a quicksell from a bot, anyway. Flipped onto MPTF very soon after.

Sale 2

https://backpack.tf/item/8338501771

Piu Piu's bot "CASHING OUT" > Erik

https://gyazo.com/326a5609eb71c61e75d42045561ca2c1

Bulk quicksell. Excluding.

Sale 3

https://backpack.tf/item/8338501771

Clown > ♥Dom Sniper Boyfriend♥

https://backpack.tf/profiles/76561199085020167#!/compare/1606089600/1606262400

https://backpack.tf/profiles/76561198101521395#!/compare/1606089600/1606262400

Untraceable.

Conclusion

Using the valid sales, we have three sales: 22.58, 22.73, and 22.86. Going with a̶ ̶r̶a̶n̶g̶e̶ ̶o̶f̶ ̶2̶2̶.̶6̶-̶2̶2̶.̶9̶ ̶k̶e̶y̶s 23 keys flat.