Resuggesting! Thank you to Erik for letting me know of something I missed for one of the sales in the mini used here!

Item 1

https://backpack.tf/item/12576419159

Sale #2

Untraceable-

Seller: https://backpack.tf/profiles/76561198036519805#!/compare/1685664000/1686268800

Buyer: https://backpack.tf/profiles/76561198044164790#!/compare/1686182400/1686268800

Sale #3

Sold with one key for a Circling Peace Sign Hong Kong Cone (62 keys) = 62-1 = 61 keys-

Seller: https://backpack.tf/profiles/76561198044164790#!/compare/1686268800/1686528000

Buyer: https://backpack.tf/profiles/76561198042480596#!/compare/1686355200/1686528000

Sale #4

Untraceable-

Seller: https://backpack.tf/profiles/76561198042480596#!/compare/1686528000/1686700800

Buyer: https://backpack.tf/profiles/76561199073805105#!/compare/1686528000/1686614400

Rest of the history seems to have been gambled so not worth looking thru it at all

https://backpack.tf/item/12576419159

Item 2

https://backpack.tf/item/7278849283

Sale #5

Bulk sale-

Seller: https://backpack.tf/profiles/76561199026390261#!/compare/1689120000/1689292800

Buyer: https://backpack.tf/profiles/76561198091502579#!/compare/1689033600/1689379200

Sale #6

Untraceable-

Seller: https://backpack.tf/profiles/76561198091502579#!/compare/1689379200/1689724800

Buyer: https://backpack.tf/profiles/76561198359588915#!/compare/1689120000/1690934400

Item 3

https://backpack.tf/item/7899609577

Sale #7

Untraceable-

Seller: https://backpack.tf/profiles/76561198301015840#!/compare/1687219200/1689379200

Buyer: https://backpack.tf/profiles/76561198018780224#!/compare/1687910400/1689811200

Marketplace.tf Sales

https://marketplace.tf/items/tf2/31016;5;u114

MP.TF Sale #1

Sold for $179.99 on May 21, 2023

Keys @ $2.02

179.99/2.02 = 89.10ish keys

MP.TF Sale #2

Sold for $179.99 on June 28, 2023

Keys @ $1.99

179.99/1.99 = 90.45ish keys

MP.TF Sale #3

Sold for $199.99 on July 30, 2023

Keys @ $1.95

199.99/1.95 = 102.56ish keys

Sales @ 61, 89, 90, 103

Taking 61-103 here