Item 1

https://backpack.tf/item/7957625125

Sale 1

https://backpack.tf/profiles/76561198337734785#!/compare/1685232000/1685318400

https://backpack.tf/profiles/76561198354459626#!/compare/1685232000/1685318400

Can only match an incomplete amount of keys

Sale 2

https://backpack.tf/profiles/76561198354459626#!/compare/1685404800/1685491200

https://backpack.tf/profiles/76561199026390261#!/compare/1686009600/1686096000

Might be a missing history here?

Item 2

https://backpack.tf/item/4553176041

Sale 3

https://backpack.tf/profiles/76561199128620418#!/compare/1685318400/1685404800

https://backpack.tf/profiles/76561198280524116#!/compare/1685232000/1685318400

9 keys

Sale 4

https://backpack.tf/profiles/76561198280524116#!/compare/1685404800/1685491200

https://backpack.tf/profiles/76561198249787656#!/compare/1498694400/1691107200

No clue

Item 3

https://backpack.tf/item/2528634236

Sale 5

https://backpack.tf/profiles/76561198337734785#!/compare/1686096000/1686182400

https://backpack.tf/profiles/76561198280524116#!/compare/1686096000/1686182400

9 keys

Mp.tf

https://marketplace.tf/items/tf2/602;5;u57

$19.99 / $1.99 = ~10 keys (Jun 7)

$19.16 / $1.96 = ~9.5 keys (Jul 21)

$19.16 / $1.95 = ~10 keys (Aug 1)

Total Sales

9, 9, 9.5, 10, 10

https://imgur.com/a/P04cK1y

If I had to guess sale 1 was a mp.tf sale that was dumped, but there's multiple sales at each end of the range, so this should be fine

Taking 9 - 10 keys c: