Item 1

https://backpack.tf/item/12959459770

Sale 1

https://backpack.tf/profiles/76561198411721849#!/compare/1683676800/1684022400

https://backpack.tf/profiles/76561198376885782#!/compare/1683590400/1683676800

No clue

Sale 2

https://backpack.tf/profiles/76561198376885782#!/compare/1683763200/1683849600

https://backpack.tf/profiles/76561198010200676#!/compare/1683849600/1684108800

No clue

Sale 3

https://backpack.tf/profiles/76561198010200676#!/compare/1684281600/1684368000

https://backpack.tf/profiles/76561198072217399#!/compare/1683849600/1685577600

26 keys + Strange Bottle + Tour of Duty Ticket

26 + ~1 = ~27 keys

Item 2

https://backpack.tf/item/12546519732

Sale 4

https://backpack.tf/profiles/76561198174469803#!/compare/1685664000/1686009600

https://backpack.tf/profiles/76561199103991885#!/compare/1685923200/1686009600

No clue

Ignoring the buy into re-dump...

Sale 5

https://backpack.tf/profiles/76561199103991885#!/compare/1686700800/1686787200

https://backpack.tf/profiles/76561198069239963#!/compare/1686096000/1686787200

Probably bot - - > bot owner

Sale 6

https://backpack.tf/profiles/76561198069239963#!/compare/1687996800/1688860800

https://backpack.tf/profiles/76561198061591743#!/compare/1688860800/1689811200

No clue, keys don't match

Item 3

https://backpack.tf/item/12231004592

Sale 7

https://backpack.tf/profiles/76561198118677366#!/compare/1684627200/1685318400

https://backpack.tf/profiles/76561199110809353#!/compare/1684540800/1684627200

Can only match an incomplete amount of keys on seller side

Sale 8

https://backpack.tf/profiles/76561199110809353#!/compare/1685059200/1685145600

https://backpack.tf/profiles/76561198086466315#!/compare/1681948800/1685836800

No clue

Item 4

https://backpack.tf/item/12188291463

Covering this in a sec

Mp.tf

https://marketplace.tf/items/tf2/31308;5;u258

$74.99 / $1.99 = ~38 keys (May 29)

$69.99 / $1.96 = ~36 keys (Jul 19)

Total Sales

27, 36, 38

https://imgur.com/a/Wq12YOr

Mp.tf sales seem high based on current sellers

Taking 27 keys c: