Item 1

https://backpack.tf/item/11321431623

Sale #1

Sold for 30 keys-

Seller: https://backpack.tf/profiles/76561199057187154#!/compare/1682985600/1683072000

Buyer: https://backpack.tf/profiles/76561198097011644#!/compare/1682985600/1683072000

Item 2

https://backpack.tf/item/7956716696

Sale #2

Untraceable? None of the keys in the buyer's backpack trace-

Seller: https://backpack.tf/profiles/76561199072654974#!/compare/1684281600/1684368000

Buyer: https://backpack.tf/profiles/76561198370014787#!/compare/1684368000/1684540800

Sale #3

Untraceable-

Seller: https://backpack.tf/profiles/76561198370014787#!/compare/1685664000/1686700800

Buyer: https://backpack.tf/profiles/76561198337734785#!/compare/1687046400/1687132800

Sale #4

Untraceable?-

Seller: https://backpack.tf/profiles/76561198337734785#!/compare/1688774400/1688860800

Buyer: https://backpack.tf/profiles/76561199111073161#!/compare/1689120000/1689292800

Marketplace.tf Sales

https://marketplace.tf/items/tf2/30418;5;u10

MP.TF Sale #1

Sold for $79.99 on June 24, 2023

Keys @ $2.03

79.99/2.03 = 39.40ish keys

MP.TF Sale #2

Sold for $79.99 on July 16, 2023

Keys @ $1.97

79.99/1.97 = 40.60ish keys

Sales @ 30, 39, 41

Taking 39-41 here