Item 1

https://backpack.tf/item/10656860576

Sale #1

Untraceable-

Seller: https://backpack.tf/profiles/76561198453530349#!/compare/1684022400/1684108800

Buyer: https://backpack.tf/profiles/76561199090720203#!/compare/1683590400/1685404800

Sale #2

Bulk-

Seller: https://backpack.tf/profiles/76561199090720203#!/compare/1685404800/1687996800

Buyer: https://backpack.tf/profiles/76561199111073161#!/compare/1685836800/1685923200

Sale #3

Sold for 23 keys + 11 refined (ID "13329846341" of the unusual matches)-

Seller: https://backpack.tf/profiles/76561199111073161#!/compare/1690848000/1690934400

Buyer: https://backpack.tf/profiles/76561199257984577#!/compare/1687219200/1691539200

Marketplace.tf Sales

https://marketplace.tf/items/tf2/1172;5;u3070

MP.TF Sale #1

Sold for $49.99 on June 21, 2023

Keys @ $1.95

49.99/1.95 = 25.64ish keys

MP.TF Sale #2

Sold for $49.99 on August 5, 2023

Keys @ $2

49.99/2 = 25ish keys

Sales @ 23, 25, 26

Taking 23-26 here