Item 1

https://backpack.tf/item/6186233945

Sale #1

Untraceable-

Seller: https://backpack.tf/profiles/76561199079429591#!/compare/1686873600/1687564800

Buyer: https://backpack.tf/profiles/76561198090829296#!/compare/1688256000/1688860800

Item 2

https://backpack.tf/item/1292546876

Sale #2

Untraceable-

Seller: https://backpack.tf/profiles/76561198127219033#!/compare/1688169600/1690502400

Buyer: https://backpack.tf/profiles/76561198428432625#!/compare/1688083200/1688256000

Item 3

https://backpack.tf/item/615992819

Not using given that it is duped

Item 4

https://backpack.tf/item/4585091963

Sale #3

Sold for 26 keys-

Seller: https://backpack.tf/profiles/76561198337734785#!/compare/1687651200/1687737600

Buyer: https://backpack.tf/profiles/76561198035547951#!/compare/1687478400/1687651200

Proof: https://imgur.com/a/Pt20nSZ

Sale #4

Sold for 16 keys (no compare links available)-

Proof: https://imgur.com/a/ZUgur98

Marketplace.tf Sales

https://marketplace.tf/items/tf2/223;5;u30

MP.TF Sale #1

Sold for $39.55 on August 8, 2023

Average Key Price @ $1.99ish

39.55/1.99 = 19.87ish keys

MP.TF Sale #2

Sold for $39.55 on August 21, 2023

Average Key Price @ $2.02ish

39.55/2.02 = 19.57ish keys

MP.TF Sale #3

Sold for $39.55 on August 28, 2023

Average Key Price @ $1.99ish

39.55/1.99 = 19.87ish keys

Sales @ 16, 20, 20, 20, 26

Taking 20 flat here