I can see my face from here.

https://backpack.tf/item/5523561613

Sale 1) Sold + Lime BMOC (~5 Keys) + 3 Keys for a Haunted Ghosts Full Metal Drill Hat (41.5 Keys) + Showstopper Results are In (6.25 Keys)

https://backpack.tf/profiles/76561198182584054#!/compare/1526515200/1526774400

http://www.tf2outpost.com/trade/29653852 - Capped by the Buyout of 37 Keys

Sale 2) Sold + 1 Key for an Electrostatic Human Cannonball (32 Keys) + ~2 Keys of Items

https://backpack.tf/profiles/76561198182584054#!/compare/1528070400/1528329600

https://backpack.tf/profiles/76561198047007251#!/compare/1528243200/1528329600

32 + 2 - 1 = 33 Keys

Cannonball Mini

https://backpack.tf/profiles/76561197960393800#!/compare/1524873600/1525132800 - Added 8 Keys for a Miami Modest (Sellers at 40)

https://backpack.tf/profiles/76561198086793593#!/compare/1525132800/1525305600 - Added ~8 Keys of Items + 4 Keys for a Demonflame Escorter

https://backpack.tf/profiles/76561198039731024#!/compare/1527897600/1527984000 - 32 Keys

https://backpack.tf/profiles/76561198047007251#!/compare/1528156800/1528243200 - 32 Keys

https://backpack.tf/profiles/76561198182584054#!/compare/1528416000/1528934400 - Added 23 Keys for a Hellfire Counterfeit Billycock

https://backpack.tf/profiles/76561198060375373#!/compare/1528848000/1528934400 - Buyer's side for the Billy sale

https://backpack.tf/profiles/76561198060375373#!/compare/1528848000/1528934400 - Quicksold for 22 Keys + 1 Refined

Taking 32 Keys for the Cannonball.

Sale 3) Sold for a Tesla Coil Towering Titanium Pillar of Hats + 4 Keys

https://backpack.tf/profiles/76561198047007251#!/compare/1528329600/1528416000

https://backpack.tf/profiles/76561197960984512#!/compare/1528329600/1528416000

Low outlier.

Titanium Mini

https://backpack.tf/profiles/76561198177162678#!/compare/1529452800/1529539200 - 18 Keys

https://backpack.tf/profiles/76561198045199590#!/compare/1524182400/1524355200 - 18 Keys

https://backpack.tf/profiles/76561198045199590#!/compare/1527292800/1527552000 - Purple Confetti Madame Dixie + 6 Keys

https://backpack.tf/profiles/76561198287940798#!/compare/1527897600/1527984000 - Circling TF Logo Hottie's Hoodie

https://backpack.tf/profiles/76561198175420885#!/compare/1527897600/1527984000 - 18 Keys

https://backpack.tf/profiles/76561198047007251#!/compare/1528329600/1528416000 - Quickbuy listing

https://backpack.tf/profiles/76561198142819483#!/compare/1528761600/1528848000 - 16 Keys, probably 19 with the Bristle selling for Keys

Sale 4) Sold for a Sunbeams Madame Dixie (31 Keys) + Negligible Items

https://backpack.tf/profiles/76561197960984512#!/compare/1528416000/1528502400

https://backpack.tf/profiles/76561198070917778#!/compare/1528416000/1528502400

Rounds to 31 Keys

Dixie Mini

https://backpack.tf/suggestion/5b345351cf6c755acc581592 - 31 Keys

Credits to Joxu for Sales 2, 3, and 4 (but me for the Minis).