https://backpack.tf/item/11143490720

10 keys:

https://backpack.tf/profiles/76561199192607141#!/compare/1672617600/1672704000

https://backpack.tf/profiles/76561198039834209#!/compare/1672185600/1672790400

https://backpack.tf/item/9678963652

Untrace:

https://backpack.tf/profiles/76561198311498888#!/compare/1672012800/1672099200

https://backpack.tf/profiles/76561198120716607#!/compare/1666742400/1672963200

Was possibly 8 keys https://stntrading.eu/item/tf2/Unusual+Mysterious+Mixture+Taunt%3A+Surgeon%27s+Squeezebox

https://backpack.tf/item/6463267746

https://marketplace.tf/items/tf2/30918;5;u3092

$21.9 / $2.03 = 10.79 keys ~11 keys

mp buyer then dumped it to a bot:

https://backpack.tf/profiles/76561197970262340#!/compare/1677542400/1679356800

https://backpack.tf/profiles/76561199192607141#!/compare/1679270400/1679356800

~~

https://mannco.store/item/440-mysterious-mixture-unusual-taunt-surgeons-squeezebox

$24.99 / $1.87 = 13.36 keys ~13 keys

~~

https://backpack.tf/item/6463267746 Seller at 10 keys for 1 day

We have a bot dump and sales at (potentially 8), 10, 11 (unusable), 13

Given the bot dump, the potential sale at 8 and the seller at 10 (even though 1 day technically isn't long enough to use as counter evidence), the sale at 13 looks out of place

Gonna go with 10 keys flat for now