Resuggesting! Many thanks to Erik for giving me a more appropriate range and the reasoning for it!

Item 1

https://backpack.tf/item/11756503228

Sale #1

Untraceable-

Seller: https://backpack.tf/profiles/76561198084635414#!/compare/1683331200/1683676800

Buyer: https://backpack.tf/profiles/76561198453530349#!/compare/1683244800/1683331200

Sale #2

Sold for 27 keys on buyer's side? Untraceable or just not usable seeing how low it is-

Seller: https://backpack.tf/profiles/76561198453530349#!/compare/1686787200/1686873600

Buyer: https://backpack.tf/profiles/76561198067077562#!/compare/1686096000/1686873600

Item 2

https://backpack.tf/item/7957248600

Sale #3

Untraceable-

Seller: https://backpack.tf/profiles/76561198040900748#!/compare/1688083200/1688256000

Buyer: https://backpack.tf/profiles/76561198335558513#!/compare/1688169600/1688342400

Sale #4

Untraceable-

Seller: https://backpack.tf/profiles/76561198335558513#!/compare/1688342400/1688947200

Buyer: https://backpack.tf/profiles/76561198037457509#!/compare/1688947200/1689120000

Sale #5

Untraceable-

Seller: https://backpack.tf/profiles/76561198037457509#!/compare/1689120000/1689811200

Buyer: https://backpack.tf/profiles/76561198258001464#!/compare/1689120000/1689811200

Item 3

https://backpack.tf/item/2571436893

Sale #6

Untraceable-

Seller: https://backpack.tf/profiles/76561199111073161#!/compare/1688774400/1688860800

Buyer: https://backpack.tf/profiles/76561198311498888#!/compare/1689292800/1689379200

Item 4

https://backpack.tf/item/7956622031

Sale #7

Untraceable-

Seller: https://backpack.tf/profiles/76561198335558513#!/compare/1688342400/1688947200

Buyer: https://backpack.tf/profiles/76561198177872379#!/compare/1688342400/1688947200

Marketplace.tf Sales

https://marketplace.tf/items/tf2/465;5;u62

MP.TF Sale #1

Sold for $91.99 on April 29, 2023

Keys @ $2.05

91.99/2.05 = 44.87ish keys

MP.TF Sale #2

Sold for $91.99 on May 18, 2023

Keys @ $2.02

91.99/2.02 = 45.54ish keys

MP.TF Sale #3

Sold for $91.99 on May 18, 2023

Keys @ $2.02

91.99/2.02 = 45.54ish keys

MP.TF Sale #4

Sold for $129.99 on June 23, 2023

Keys @ $2

129.99/2 = 65ish keys

MP.TF Sale #5

Sold for $129.99 on July 12, 2023

Keys @ $1.95

129.99/1.95 = 66.66ish keys

MP.TF Sale #6

Sold for $129.99 on July 24, 2023

Keys @ $1.95

129.99/1.95 = 66.66ish keys

Sales @ 45, 46, 46, 65, 67

Taking 45-65 here