Item 1

https://backpack.tf/item/12310561306

Sale 1

https://backpack.tf/profiles/76561198311498888#!/compare/1683417600/1683504000

https://backpack.tf/profiles/76561199059160806#!/compare/1683331200/1683417600

No clue

Sale 2

https://backpack.tf/profiles/76561199059160806#!/compare/1683763200/1683849600

https://backpack.tf/profiles/76561198123518712#!/compare/1683763200/1683849600

~4.40 keys

Item 2

https://backpack.tf/item/12156975323

Sale 3

https://backpack.tf/profiles/76561198397414648#!/compare/1686873600/1690588800

https://backpack.tf/profiles/76561198054795791#!/compare/1689811200/1691020800

Can't load seller inv

Item 3

https://backpack.tf/item/11085044399

I'll cover mp.tf at the end

Item 4

https://backpack.tf/item/12291680550

Sale 5

https://backpack.tf/profiles/76561199245733895#!/compare/1684540800/1684627200

https://backpack.tf/profiles/76561198057412106#!/compare/1684800000/1684886400

No clue

Sale 6

https://backpack.tf/profiles/76561198057412106#!/compare/1684886400/1684972800

https://backpack.tf/profiles/76561198204505424#!/compare/1684886400/1685404800

8 keys?

Item 5

https://backpack.tf/item/12241968899

Sale 7

https://backpack.tf/profiles/76561198850121720#!/compare/1684627200/1684713600

https://backpack.tf/profiles/76561198012410589#!/compare/1684368000/1684800000

No clue

Sale 8

https://backpack.tf/profiles/76561198012410589#!/compare/1686268800/1686960000

https://backpack.tf/profiles/76561198850178158#!/compare/1686787200/1686873600

Can only match ref

Sale 9

https://backpack.tf/profiles/76561198850178158#!/compare/1687824000/1687910400

https://backpack.tf/profiles/76561198311498888#!/compare/1687824000/1687910400

No clue

Mp.tf

https://marketplace.tf/items/tf2/1183;5;u3097

$11.99 / $2.03 = ~6 keys (May 15)

$11.99 / $1.99 = ~6 keys (Jun 6)

Total Sales

4.4, 6, 6, 8

https://imgur.com/a/b3j9Etq

Lower seller on STN, but there's many higher sales

Taking 4.5 - 8 keys? (4.4 rounds up since median is >5)