All credits to Cashew. All I did was reformat.

Accidental counter..

Sale 1: Sold for 36 keys

https://backpack.tf/profiles/76561198059021831#!/compare/1585958400/1586044800

https://backpack.tf/profiles/76561198052246700#!/compare/1585958400/1586044800

Sale 2: Sold for Sunbeams Hetman (24 keys) + 21 keys

https://backpack.tf/profiles/76561198052246700#!/compare/1588550400/1588636800

https://backpack.tf/profiles/76561198121428749#!/compare/1588550400/1588636800

24 + 21 = 45 keys

Sale 3: Sold for 31 keys

https://backpack.tf/profiles/76561198272038643#!/compare/1588636800/1588723200

https://backpack.tf/profiles/76561198061634071#!/compare/1588636800/1588723200 31 keys

Sale 4: Unknown

https://backpack.tf/profiles/76561198121428749#!/compare/1588636800/1588723200

https://backpack.tf/profiles/76561198061634071#!/compare/1588723200/1589241600

First seller was unsold for months below 45

https://bot.tf/stats/listings/4O99Q6EJ 40

https://bot.tf/stats/listings/M0D6D6PZ 38

https://bot.tf/stats/listings/MGZ1EOV7 42

Sales at 31, 36, and 45. Seller for below 45 was unsold for months. Excluding 45.

Taking a range of 31-36 keys here.