Item 1

https://backpack.tf/item/12666335237

Sale 1

Probably a scrap.tf auction, no way of knowing

Sale 2

https://backpack.tf/profiles/76561198033165804#!/compare/1685059200/1685491200

https://backpack.tf/profiles/76561198311498888#!/compare/1685318400/1685491200

Probably bought for 48 keys and dumped to STN for an unknown amount

Item 2

https://backpack.tf/item/10772681242

Ignoring gambling stuff...

Sale 3

https://backpack.tf/profiles/76561198113622176#!/compare/1681948800/1682035200

https://backpack.tf/profiles/76561198453530349#!/compare/1681862400/1681948800

Can only match ref

Item 3

https://backpack.tf/item/5582611285

Sale 4

https://backpack.tf/profiles/76561198192135953#!/compare/1682467200/1683763200

https://backpack.tf/profiles/76561199183207724#!/compare/1686787200/1687132800

No clue how much tradeit paid for this

Mp.tf

https://marketplace.tf/items/tf2/671;5;u19

$129.99 / $2.05 = ~63 keys

Total Sales

48, 63

https://imgur.com/a/BIibGNw

2 unsolds @~54

https://stntrading.eu/item/tf2/Unusual+Circling+Heart+Brown+Bomber

1 unsold here @~53

63 seems high, a drop seems fine here

Taking 48 keys c: