Item 1

https://backpack.tf/item/12280565755

Sale #1

Untraceable-

Seller: https://backpack.tf/profiles/76561199088509433#!/compare/1685836800/1687305600

Buyer: https://backpack.tf/profiles/76561199245733895#!/compare/1687305600/1687392000

Item 2

https://backpack.tf/item/9357548867

Sale #2

Untraceable-

Seller: https://backpack.tf/profiles/76561199084784906#!/compare/1685577600/1685664000

Buyer: https://backpack.tf/profiles/76561198107823270#!/compare/1685491200/1685664000

Sale #3

Seems to have been traded with some things, but untraceable-

Seller: https://backpack.tf/profiles/76561198107823270#!/compare/1685750400/1686614400

Buyer: https://backpack.tf/profiles/76561199084784906#!/compare/1686441600/1686528000

Sale #4

Untraceable-

Seller: https://backpack.tf/profiles/76561199084784906#!/compare/1689120000/1689292800

Buyer: https://backpack.tf/profiles/76561198976511412#!/compare/1689033600/1689897600

Item 3

https://backpack.tf/item/3881242559

Sale #5

Untraceable-

Seller: https://backpack.tf/profiles/76561199026390261#!/compare/1683072000/1683158400

Buyer: https://backpack.tf/profiles/76561198048174130#!/compare/1476403200/1683158400

Item 4

https://backpack.tf/item/12267684281

Sale #6

Transfer probably-

Seller: https://backpack.tf/profiles/76561199192607141#!/compare/1684540800/1684627200

Buyer: https://backpack.tf/profiles/76561199099521803#!/compare/1684627200/1684713600

Sale #7

Untraceable-

Seller: https://backpack.tf/profiles/76561199099521803#!/compare/1684886400/1685145600

Buyer: https://backpack.tf/profiles/76561198311498888#!/compare/1684886400/1685059200

Sale #8

Bulk Sale-

Seller: https://backpack.tf/profiles/76561198311498888#!/compare/1689033600/1689120000

Buyer: https://backpack.tf/profiles/76561198091502579#!/compare/1689033600/1689379200

Marketplace.tf Sales

https://marketplace.tf/items/tf2/1118;5;u3095

MP.TF Sale #1

Sold for $45 on May 12, 2023

Keys @ $2.03

45/2.03 = 22.17ish keys

MP.TF Sale #2

Sold for $45 on June 12, 2023

Keys @ $1.98

45/1.98 = 22.73ish keys

MP.TF Sale #3

Sold for $74.99 on July 7, 2023

Keys @ $1.99

74.99/1.99 = 37.68ish keys

Sales @ 22, 23, 38

Taking 22-38