Grimm Reaper

https://backpack.tf/item/328747601

Sale 1) ?

https://backpack.tf/profiles/76561198035621155#!/compare/1551484800/1552176000

https://backpack.tf/item/336374567

Sale 2) Sold for 26 Keys

https://backpack.tf/profiles/76561198124660108#!/compare/1555200000/1555459200

Low outlier.

Sale 3) Quicksold for 32 Keys

https://backpack.tf/profiles/76561198068662125#!/compare/1555200000/1555286400

https://backpack.tf/profiles/76561198129564285#!/compare/1555200000/1555286400

Sale 4) Sold + 3 Keys for a Sunbeams Head Full of Hot Air

https://backpack.tf/profiles/76561198129564285#!/compare/1555200000/1555286400

https://backpack.tf/profiles/76561198089247727#!/compare/1555200000/1555286400

Using for the Hot Air.

Sale 5) Sold for 34 Keys?

https://backpack.tf/profiles/76561198089247727#!/compare/1555459200/1555632000

https://backpack.tf/profiles/76561198017901187#!/compare/1553040000/1555977600

https://backpack.tf/item/1095608410

Sale 6) ?

https://backpack.tf/profiles/76561198866419663#!/compare/1551052800/1551139200

Sale 7) Sold for $88.78 when Keys were ~$1.77 each

https://marketplace.tf/items/383;5;u8

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

88.78 / 1.77 = 50.15, which rounds to 50 Keys

https://backpack.tf/item/279726629

Sale 8) Quicksold for 32 Keys

https://backpack.tf/profiles/76561198122096342#!/compare/1553126400/1553299200

Sale 9) Sold for 38 Keys

https://backpack.tf/profiles/76561198002757046#!/compare/1556582400/1556668800

https://backpack.tf/profiles/76561198176343442#!/compare/1556668800/1556755200

Sale 10) Sold for a Cauldron Bubbles Troublemaker's Tossle Cap (37 Keys) + Killstreak Australium Stickybomb Launcher (~14 Keys) + 1 Key

https://backpack.tf/profiles/76561198176343442#!/compare/1556928000/1557187200

https://backpack.tf/profiles/76561198075376991#!/compare/1557100800/1557187200

https://imgur.com/a/6DSMzss - Capped by the Buyout of 47 Keys

https://backpack.tf/item/920802090

Sale 11) Sold for 35 Keys to a buy order

https://backpack.tf/profiles/76561198133933158#!/compare/1550966400/1551052800

Sale 12) Sold for 39 Keys

https://backpack.tf/profiles/76561198002757046#!/compare/1552176000/1552262400

Sale 13) ?

https://backpack.tf/profiles/76561198381568825#!/compare/1553472000/1553558400

Sale 14) Sold + 9 Keys for a Haunted Ghosts Tyrant's Helm

https://backpack.tf/profiles/76561198092371264#!/compare/1557273600/1558051200

https://backpack.tf/profiles/76561198160856661#!/compare/1557187200/1557273600

This should be used for the Tyrant's.

Counting 35 as low since it went to a buy order at the time.