BAWK

http://backpack.tf/item/4442291205

Sale 1) Sold + Strange Pro KS Winger (1) for a Flaming Lantern Dead Cone (19.5 Keys)

http://backpack.tf/profiles/76561198136517766/#!/compare/1453449600/1454313600

19.5 - 1 = 18.5 Keys, which I'm rounding to 19 Keys

http://backpack.tf/item/2786739186

Sale 2) Sold for 15 Keys + Strange Silver Botkiller Minigun Mk.II w/ Parts (4)

http://backpack.tf/profiles/76561198104321004?time=1454400000

15 + 4 = 19 Keys

Sale 3) Quicksold for 18 Keys

http://backpack.tf/profiles/76561198074120641/#!/compare/1454140800/1454227200

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Even if I didn't count the parts on the Minigun in Sale 2, thus making that Sale 15 Keys, it is countered by Sale 3, and Sale 1 is still 19 Keys.