Item 1

https://backpack.tf/item/12831084818

Sale #1

Untraceable-

Seller: https://backpack.tf/profiles/76561198866899324#!/compare/1658102400/1687996800

Buyer: https://backpack.tf/profiles/76561199026390261#!/compare/1687910400/1687996800

Sale #2

Untraceable-

Seller: https://backpack.tf/profiles/76561199026390261#!/compare/1688428800/1688515200

Buyer: https://backpack.tf/profiles/76561198883149330#!/compare/1688515200/1688601600

Sale #3

Sold for a Kill-a-Watt Das Maddendoktor (32 keys) + a Strange Oktoberfester (5.44 refined) + a Throttlehead (3 refined) + a Criminal Cloak (1.55 refined) + a Archer's Grounding (2.11 refined) + 6 keys + 32 refined = 32+6+1ish key in sweets and metal = 39 keys-

Seller: https://backpack.tf/profiles/76561198883149330#!/compare/1688515200/1688601600

Buyer: https://backpack.tf/profiles/76561198061182096#!/compare/1688083200/1688774400

MP.TF Sale #1

Sold for $90 on August 27, 2023

Average Key Price @ $1.99ish

90/1.99 = 45.22ish keys

https://marketplace.tf/items/tf2/31344;5;u10

Sales @ 39, 45

Taking 39-45 here