Item 1

https://backpack.tf/item/8314926321

Sale #1

Sold for 2 keys (Keys in buyer's side match)

Seller: https://backpack.tf/profiles/76561199200577753#!/compare/1686009600/1686182400

Buyer: https://backpack.tf/profiles/76561199219904980#!/compare/1686096000/1686182400

Sale #2

Bulk transfer?-

Seller: https://backpack.tf/profiles/76561199219904980#!/compare/1686700800/1686787200

Buyer: https://backpack.tf/profiles/76561198402614129#!/compare/1686787200/1686873600

Item 2

https://backpack.tf/item/7458238965

Sale #3

Untraceable-

Seller: https://backpack.tf/profiles/76561199192893105#!/compare/1687392000/1687478400

Buyer: https://backpack.tf/profiles/76561198135388328#!/compare/1690416000/1690502400

Item 3

https://backpack.tf/item/9684535976

Sale #4

Bulk sale-

Seller: https://backpack.tf/profiles/76561198085849469#!/compare/1685491200/1685836800

Buyer: https://backpack.tf/profiles/76561198151502845#!/compare/1685664000/1686009600

Marketplace.tf Sales

https://marketplace.tf/items/tf2/30919;5;u3008

MP.TF Sale #1

Sold for $6.66 on May 20, 2023

Keys @ $2.02

6.66/2.02 = 3.30ish keys

MP.TF Sale #2

Sold for $6.66 on May 23, 2023

Keys @ $2

6.66/2 = 3.33 keys

MP.TF Sale #3

Sold for $6.66 on May 24, 2023

Keys @ $2

6.66/2 = 3.33 keys

MP.TF Sale #4

Sold for $6.66 on May 25, 2023

Keys @ $2

6.66/2 = 3.33 keys

MP.TF Sale #5

Sold for $6.66 on July 6, 2023

Keys @ $1.99

6.66/1.99 = 3.35ish keys

MP.TF Sale #6

Sold for $6.66 on July 13, 2023

Keys @ $1.95

6.66/1.95 = 3.42ish keys

MP.TF Sale #7

Sold for $6.66 on July 17, 2023

Keys @ $1.97

6.66/1.97 = 3.38ish keys

Sales @ 2, 3.30, 3.33, 3.33, 3.33, 3.35, 3.38, 3.42

Taking 3-3.40 here