Counter.

Sale 1: Sold for 43 keys

https://backpack.tf/profiles/76561198033370726#!/compare/1570406400/1570579200

https://backpack.tf/profiles/76561198040254772#!/compare/1570406400/1570492800

Sale 2: Untraceable

https://backpack.tf/profiles/76561198040254772#!/compare/1570665600/1570752000

https://backpack.tf/profiles/76561198050745352#!/compare/1570665600/1570752000

Sale 3: Marketplace

Sold for 60 on october 12

https://marketplace.tf/items/tf2/622;5;u71

60/1.82 = 32.96 rounding to 33 keys

Duped sales

Sale 1: Sold for 40 keys

https://backpack.tf/profiles/76561198305676157#!/compare/1572652800/1572739200

https://backpack.tf/profiles/76561198059098316#!/compare/1572652800/1572739200

Sale 2: Sold for 40 keys

https://backpack.tf/profiles/76561198140565712#!/compare/1572652800/1572739200

https://backpack.tf/profiles/76561198020224041#!/compare/1572739200/1572825600

Classifieds:

https://gyazo.com/7522ab46f559e32da8d7d340409ff425

Conclusion:

Clean sale at 43. Marketplace sale at 33. Duped sales at 40 and 40.

33 is low due to buyers at 35. Both 40 key sales were dupes.

Taking 43 keys.