Turns out I can't use the Buyer's buyout.

http://backpack.tf/item/4125052954

Sale 1) Sold for a Sulphurous Samur-Eye (100 Keys) + Purple Energy Nanobalaclava + Death at Dusk Prancer's Pride

http://backpack.tf/profiles/76561198085269574#!/compare/1480377600/1480464000

http://www.tf2outpost.com/trade/28636029 - Capped by the Buyout of 180 Keys

Sale 2) Sold + Magnetic Hat Protector Universal Translator for a Demonflame Le Party Phantom

http://backpack.tf/profiles/76561198120147285#!/compare/1481932800/1482019200

Better used for the Phantom.

http://backpack.tf/item/2802131960

Sale 3) Sold for a Hellish Inferno Zoomin' Broom (160 Keys) + 25 Keys

http://backpack.tf/profiles/76561197991710013#!/compare/1485820800/1485907200

160 + 25 = 185 Keys

Sale 4) Sold for an Infernal Smoke Rancho Relaxo + Vivid Plasma Pyromancer's Mask + Circling TF Logo Large Luchadore + BS Cool Blitzkrieg Knife

http://backpack.tf/profiles/76561198096389539#!/compare/1486512000/1486598400

http://www.tf2outpost.com/trade/28760904 - Capped by the Buyout of 160 Keys

http://imgur.com/a/q44Y7 - Since the first one hasn't sold for 5 months, I'll cap sale 3 at 180 Keys.