sale 1/2:

https://marketplace.tf/items/tf2/539;5;u34

$39.99 / $1.77 = 22.59 keys

$39.99 / $1.76 = 22.72 keys

https://backpack.tf/item/613451062

sale 3:

looks like Genuine El Jefe was involved, but apart from that untrace

https://backpack.tf/profiles/76561198282631979#!/compare/1658448000/1658966400

https://backpack.tf/profiles/76561198154023527#!/compare/1649203200/1653696000

no recent compare from seller, inv not loading

sale 4:

high outlier - probably due to it being double spelled

even taking buy orders this will be at least 36 keys

Sunbeams Bombing Run + KS Gold Botkiller Scattergun Mk.II + 7 keys

https://backpack.tf/profiles/76561198116720890#!/compare/1658016000/1658102400

https://backpack.tf/profiles/76561198076866709#!/compare/1657929600/1658361600