Item 1

https://backpack.tf/item/5161780233

Sale 1

https://backpack.tf/profiles/76561199072654974#!/compare/1685750400/1685836800

https://backpack.tf/profiles/76561198121146039#!/compare/1685491200/1686182400

No clue

Sale 2

https://backpack.tf/profiles/76561198121146039#!/compare/1686182400/1686268800

https://backpack.tf/profiles/76561198311498888#!/compare/1686182400/1686268800

Can only match a single key

Sale 3

https://backpack.tf/profiles/76561198311498888#!/compare/1691539200/1691625600

https://backpack.tf/profiles/76561199211648157#!/compare/1691539200/1691625600

Can only match 2 keys, which seems incomplete

Item 2

https://backpack.tf/item/4716646921

Sale 4

https://backpack.tf/profiles/76561198079001732#!/compare/1685923200/1686009600

https://backpack.tf/profiles/76561198064867773#!/compare/1685664000/1685923200

Untrace on seller side

Sale 5

https://backpack.tf/profiles/76561198064867773#!/compare/1685923200/1686009600

https://backpack.tf/profiles/76561199059160806#!/compare/1690070400/1690156800

Likely a missing history here

Item 3

https://backpack.tf/item/4411030467

Nothing here, just transfers

Item 4

https://backpack.tf/item/12191829673

Sale 6

https://backpack.tf/profiles/76561198453530349#!/compare/1691280000/1691366400

Sold to an unknown history

Sale 7

https://backpack.tf/profiles/76561199026390261#!/compare/1693094400/1693267200

Probably the Aug 6 mp.tf sale dumped here?

Mp.tf

https://marketplace.tf/items/tf2/30671;5;u3088

$12.99 / $1.99 = ~6.5 keys (Jun 1)

$9.00 / $2.01 = ~4.45 keys (Aug 22)

$11.45 / $2.00 = ~5.5 keys (Aug 26)

Total Sales

4.45, 5.5, 6.5

https://imgur.com/a/zRvSecQ

5.5 was the one that was likely dumped, but it fits nicely in the middle of the range anyways

Taking 4.5 - 6.5 keys c: (4.45 rounds up as median is >5)