History 1:

https://backpack.tf/item/10222024417

Sale 1:

https://backpack.tf/profiles/76561199125443371#!/compare/1628380800/1628467200

https://backpack.tf/profiles/76561198354459626#!/compare/1628380800/1628467200

24 keys

Sale 2:

https://marketplace.tf/items/tf2/31109;5;u148

$48.99 / $1.81 = 27.07 keys

History 2:

https://backpack.tf/item/10113292393

Sale 3:

https://backpack.tf/profiles/76561198966970656#!/compare/1626652800/1626739200

https://backpack.tf/profiles/76561198096860013#!/compare/1626652800/1626739200

untrace

History 3:

https://backpack.tf/item/9202491851

Sale 4:

https://backpack.tf/profiles/76561199102199351#!/compare/1627776000/1627862400

https://backpack.tf/profiles/76561198354622099#!/compare/1627776000/1628035200

untrace but prob 24 keys

https://gladiator.tf/sales?item=Aromatica%20Crabe%20de%20Chapeau&at=2021-08-03T04:38:42.818Z

Sale 5:

https://backpack.tf/profiles/76561198354622099#!/compare/1628985600/1629590400

https://backpack.tf/profiles/76561198070866395#!/compare/1629331200/1629504000

21 keys

History 4:

https://backpack.tf/item/9147685537

Sale 6:

https://marketplace.tf/items/tf2/31109;5;u148

$48.99 / $1.81 = 27.07 keys

History 5:

https://backpack.tf/item/9144706927

Sale 7:

https://backpack.tf/profiles/76561199103740298#!/compare/1630022400/1630195200

https://backpack.tf/profiles/76561198811485645#!/compare/1630108800/1630195200

25 keys

Sale 8:

https://backpack.tf/profiles/76561198811485645#!/compare/1630195200/1630368000

https://backpack.tf/profiles/76561198025018960#!/compare/1630281600/1630368000

untrace

[marketplace sales without matching histories]

https://marketplace.tf/items/tf2/31109;5;u148

Sale 9:

$48.99 / $1.81 = 27.07 keys

Sales:

24, 27, 24, 21, 27, 25, 27

Buyers are up to 22 keys

Gonna take a range of 24-27 keys