Thank you to Asriel for providing the screenshots used here!

Item 1

https://backpack.tf/item/13445185298

Sale #1

Untraceable?-

Seller: https://backpack.tf/profiles/76561198120812870#!/compare/1700870400/1701302400

Buyer: https://backpack.tf/profiles/76561199235932842#!/compare/1701216000/1701302400

Sale #2

Sold for 30 keys-

Seller: https://backpack.tf/profiles/76561199235932842#!/compare/1701475200/1701561600

Buyer: https://backpack.tf/profiles/76561197991477148#!/compare/1701302400/1701475200

Proof of Sale: https://imgur.com/a/5mXA77X

Item 2

https://backpack.tf/item/13378343107

Sale #3

Untraceable-

Seller: https://backpack.tf/profiles/76561198000733612#!/compare/1696723200/1696896000

Buyer: https://backpack.tf/profiles/76561198050248332#!/compare/1694563200/1696896000

Item 3

https://backpack.tf/item/13351215496

Sale #4

Sold for an Australium SMG? (this would be too low even when taking lowest seller given buyers at 21 for the taunt)-

Seller: https://backpack.tf/profiles/76561198120451582#!/compare/1696982400/1697155200

Buyer: https://backpack.tf/profiles/76561198104991389#!/compare/1697155200/1697241600

Item 4

https://backpack.tf/item/13266599480

Sale #5

Untraceable? All of the keys leaving the buyer's side match histories with the Treasure Blues-

Seller: https://backpack.tf/profiles/76561198229128244#!/compare/1643587200/1696896000

Buyer: https://backpack.tf/profiles/76561198140020052#!/compare/1700524800/1700611200

Item 5

https://backpack.tf/item/9661539599

Sale #6

Sold for 52 keys-

Seller: https://backpack.tf/profiles/76561199057285337#!/compare/1701475200/1701561600

Buyer: https://www.backpack.tf/profiles/76561198301667379#!/compare/1701129600/1701561600

Proof of Sale: https://imgur.com/a/4P54ZUW

Sales @ 30, 52

Taking 30-52 here :3