Item 1

https://backpack.tf/item/1628278109

Sale 1

https://backpack.tf/profiles/76561198016691550#!/compare/1695945600/1695513600

https://backpack.tf/profiles/76561198347872221#!/compare/1695945600/1696377600

268 keys, but I'll round it to 270 keys.

Sale 2

https://backpack.tf/profiles/76561198016691550#!/compare/1697155200/1697500800

https://backpack.tf/profiles/76561199240976002#!/compare/1697414400/1697500800

Seems to be traded for a Shining Star Decorated Veteran. It is unpriced, so I can't use it.

Item 2

https://backpack.tf/item/994270607

Sale 3

https://backpack.tf/profiles/76561198089952821#!/compare/1694390400/1694563200

https://backpack.tf/profiles/76561199315621199#!/compare/1694390400/1694476800

Traded for a Exorcism Spelled Spec KS Rust Botkiller Stickybomb Launcher. Unclear what else it was traded for. Can't use this.

Sale 4

https://backpack.tf/profiles/76561198043914746#!/compare/1696896000/1697241600

https://backpack.tf/profiles/76561198089952821#!/compare/1696723200/1696896000

276 or 280 keys - not clear which is the exact number of keys, but I'll round this to 280.

Suggestion

270, 280

I'll suggest 270-280 as the range.