Many thanks to Icycrevasse!

Item 1

https://backpack.tf/item/8778827865

Sale #1

Untraceable-

Seller: https://backpack.tf/profiles/76561198377142897#!/compare/1686182400/1686787200

Buyer: https://backpack.tf/profiles/76561198970145556#!/compare/1686009600/1686268800

Sale #2

Untraceable-

Seller: https://backpack.tf/profiles/76561198970145556#!/compare/1686268800/1686700800

Buyer: https://backpack.tf/profiles/76561198324994701#!/compare/1686355200/1686528000

Sale #3

Sold for a Circling Peace Sign Bot Dogger (11 keys) + 2 keys = 13 keys-

Seller: https://backpack.tf/profiles/76561198324994701#!/compare/1686528000/1686614400

Buyer: https://backpack.tf/profiles/76561199221753979#!/compare/1686528000/1686614400

Sale #4

Sold for a Circling Peace Sign L'Inspecteur (using this to price the L'Inspecteur)-

Seller: https://backpack.tf/profiles/76561199221753979#!/compare/1686528000/1686614400

Buyer: https://backpack.tf/profiles/76561198071610485#!/compare/1686441600/1686614400

Item 2

https://backpack.tf/item/8155481318

Sale #5

Bulk Sale-

Seller: https://backpack.tf/profiles/76561198275432423#!/compare/1685664000/1687651200

Buyer: https://backpack.tf/profiles/76561198850274253#!/compare/1687651200/1687737600

Sale #6

Untraceable-

Seller: https://backpack.tf/profiles/76561198850274253#!/compare/1688083200/1688169600

Buyer: https://backpack.tf/profiles/76561198453530349#!/compare/1688169600/1688256000

Marketplace.tf Sales

https://marketplace.tf/items/tf2/31074;5;u126

MP.TF Sale #1

Sold for $35.99 on April 18, 2023

Keys @ $2.1

35.99/2.1 = 17.14ish keys

MP.TF Sale #2

Sold for $32.99 on May 30, 2023

Keys @ $1.99

32.99/1.99 = 16.58ish keys

MP.TF Sale #3

Sold for $32.99 on June 3, 2023

Keys @ $1.99

32.99/1.99 = 16.58ish keys

MP.TF Sale #4

Sold for $27 on June 24, 2023

Keys @ $2.03

27/2.03 = 13.30ish keys

MP.TF Sale #5

Sold for $27 on June 29, 2023

Keys @ $1.97

27/1.97 = 13.71ish keys

MP.TF Sale #6

Sold for $27 on June 30, 2023

Keys @ $1.97

27/1.97 = 13.71ish keys

MP.TF Sale #7

Sold for $32.99 on July 2, 2023

Keys @ $1.96

32.99/1.96 = 16.83ish keys

Sales @ 13, 13, 14, 17, 17, 17, 17

Taking 11-13 here