Item 1

https://backpack.tf/item/10732814230

Sale #1

Untraceable-

Seller: https://backpack.tf/profiles/76561198841279602#!/compare/1684972800/1685059200

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

Sale #2

Sold for 42 keys + 0.66 refined (buyer's side)-

Seller: https://backpack.tf/profiles/76561198311498888#!/compare/1686528000/1686614400

Buyer: https://backpack.tf/profiles/76561198999432818#!/compare/1686096000/1686614400

Sale #3

Sold for 48 keys + 70 refined-

Seller: https://backpack.tf/profiles/76561198999432818#!/compare/1686700800/1686787200

Buyer: https://backpack.tf/profiles/76561198095862827#!/compare/1686700800/1686787200

Sale #4

Sold for 49 keys + 71 refined (ID "13148694803" matches that bulk)-

Seller: https://backpack.tf/profiles/76561198095862827#!/compare/1686700800/1686787200

Buyer: https://backpack.tf/profiles/76561198453530349#!/compare/1686700800/1686787200

MP.TF Sale #1

Sold for $99.99 on August 17, 2023

Average Key Price @ $2.02ish

99.99/2.02 = 49.5 keys

https://marketplace.tf/items/tf2/30378;5;u30

Sales @ 42, 49, 50, 50

Taking 42-50 here