Item 1

https://backpack.tf/item/2186731126

Sale #1

Untraceable-

Seller: https://backpack.tf/profiles/76561198453530349#!/compare/1685577600/1685664000

Buyer: https://backpack.tf/profiles/76561198280524116#!/compare/1685577600/1685664000

Item 2

https://backpack.tf/item/11509859725

Sale #3

Sold for a Haunted Ghosts Human Cannonball (21 keys) + a Non-Craftable A Distinctive Lack of Hue (1.3ish keys) = 22.3 keys-

Seller: https://backpack.tf/profiles/76561198115187476#!/compare/1686960000/1689033600

Buyer: https://backpack.tf/profiles/76561198017284265#!/compare/1687651200/1687910400

Sale #3

Sold for a Aggradation Fried Batter (too low to use here, excluding)-

Seller: https://backpack.tf/profiles/76561198017284265#!/compare/1687651200/1687910400

Buyer: https://backpack.tf/profiles/76561198044164790#!/compare/1687737600/1687910400

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Item 1

https://backpack.tf/item/10355946459

Sale #1

Bulk transfer?-

Seller: https://backpack.tf/profiles/76561199127652476#!/compare/1686528000/1686614400

Buyer: https://backpack.tf/profiles/76561198035132607#!/compare/1686873600/1686960000

Item 2

https://backpack.tf/item/10367258683

Sale #2

Untraceable-

Seller: https://backpack.tf/profiles/76561198014031869#!/compare/1685318400/1686009600

Buyer: https://backpack.tf/profiles/76561198453530349#!/compare/1685491200/1685577600

Sale #3

Untraceable-

Seller: https://backpack.tf/profiles/76561198453530349#!/compare/1687564800/1687651200

Buyer: https://backpack.tf/profiles/76561198405505391#!/compare/1687564800/1687651200

Sale #4

Untraceable-

Seller: https://backpack.tf/profiles/76561198405505391#!/compare/1687564800/1687651200

Buyer: https://backpack.tf/profiles/76561198099819303#!/compare/1687564800/1687651200

Sale #5

Untraceable-

Seller: https://backpack.tf/profiles/76561198099819303#!/compare/1687824000/1687910400

Buyer: https://backpack.tf/profiles/76561198044164790#!/compare/1687737600/1687910400

Sale #6

Sold for a Steaming Executioner-

Seller: https://backpack.tf/profiles/76561198044164790#!/compare/1687737600/1687910400

Buyer: https://backpack.tf/profiles/76561198017284265#!/compare/1687651200/1687910400

Sale #7

Untraceable-

Seller: https://backpack.tf/profiles/76561198017284265#!/compare/1687651200/1687910400

Buyer: https://backpack.tf/profiles/76561198965593434#!/compare/1688256000/1689120000

Item 3

https://backpack.tf/item/10596351073

Sale #8

Untraceable-

Seller: https://backpack.tf/profiles/76561198311498888#!/compare/1686096000/1686182400

Buyer: https://backpack.tf/profiles/76561198135388328#!/compare/1686441600/1686528000

Sale #9

Untraceable-

Seller: https://backpack.tf/profiles/76561198135388328#!/compare/1686528000/1686614400

Buyer: https://backpack.tf/profiles/76561198824279240#!/compare/1688860800/1688860800

Item 4

https://backpack.tf/item/12052637306

Sale #10

Sold for 13 keys + .33 refined-

Seller: https://backpack.tf/profiles/76561199072654974#!/compare/1687564800/1687651200

Buyer: https://backpack.tf/profiles/76561199207305975#!/compare/1687564800/1687651200

Sale #11

Untraceable-

Seller: https://backpack.tf/profiles/76561199207305975#!/compare/1687651200/1687910400

Buyer: https://backpack.tf/profiles/76561198053846657#!/compare/1687737600/1687824000

Item 5

https://backpack.tf/item/12994801470

Sale #12

Untraceable-

Seller: https://backpack.tf/profiles/76561199110809353#!/compare/1685318400/1685404800

Buyer: https://backpack.tf/profiles/76561198097427947#!/compare/1688256000/1688342400

Only sale @ 13

Not even priceable seeing how close to buyer's this is

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Sale #4

Sold for a few keys and some sweets? Most likely incomplete, untraceable-

Seller: https://backpack.tf/profiles/76561198044164790#!/compare/1687737600/1687910400

Buyer: https://backpack.tf/profiles/76561198100248826#!/compare/1688083200/1688256000

Item 3

https://backpack.tf/item/13008806344

Sale #5

Untraceable-

Seller: https://backpack.tf/profiles/76561199238815382#!/compare/1686355200/1686441600

Buyer: https://backpack.tf/profiles/76561198799694361#!/compare/1686096000/1686873600

Marketplace.tf Sales

https://marketplace.tf/items/tf2/921;5;u36

MP.TF Sale #1

Sold for $44.99 on May 29, 2023

Keys @ $1.99

44.99/1.99 = 22.61ish keys

MP.TF Sale #2

Sold for $39.99 on June 24, 2023

Keys @ $2.03

39.99/2.03 = 19.70ish keys

MP.TF Sale #3

Sold for $38.61 on July 15, 2023

Keys @ $1.98

38.61/1.98 = 19.5 keys

Sales @ 20, 20, 22, 23

Taking 20-23 here