Roast Beef

https://backpack.tf/item/635980038

Sale 1) Sold for 17 Keys

https://backpack.tf/profiles/76561198093273091#!/compare/1528416000/1546128000

Low outlier.

Sale 2) Sold for 19 Keys

https://backpack.tf/profiles/76561198349886701#!/compare/1548201600/1548288000

https://backpack.tf/profiles/76561198398071815#!/compare/1545350400/1549065600

https://backpack.tf/profiles/76561198312151880#!/compare/1548288000/1548374400 - The Keys were from the Scattergun the buyer sold first

https://backpack.tf/item/1100995518

Sale 3) Sold for an Omniscient Orb Tank Top

https://backpack.tf/profiles/76561198196067530#!/compare/1544140800/1544486400

This would be better used to price the Tank.

Sale 4) Bulk sale for a Tesla Coil Lil' Bitey

https://backpack.tf/profiles/76561198804931081#!/compare/1545696000/1545782400

Sale 5) Sold for 20 Keys

https://backpack.tf/profiles/76561198054198170#!/compare/1549756800/1549843200

https://backpack.tf/profiles/76561198090483235#!/compare/1549152000/1549843200

https://backpack.tf/item/7089661475

Sale 6) Quicksold for 17 Keys + 5.44 Refined

https://backpack.tf/profiles/76561198050518375#!/compare/1546905600/1546992000

Sale 7) Sold for a Duped Searing Plasma Head Warmer

https://backpack.tf/profiles/76561198337734785#!/compare/1548892800/1548979200

https://backpack.tf/profiles/76561198120720434#!/compare/1548979200/1549411200

High outlier.

https://marketplace.tf/items/644;5;u33 - Sold for $40.95 when Keys were ~$1.70 and $38 when Keys were ~$1.81 each

https://marketplace.tf/items/5021;6/Mann%20Co.%20Supply%20Crate%20Key

40.95 / 1.70 = 24.1, which rounds to 24 Keys

38 / 1.81 = 20.99, which rounds to 21 Keys