Other guy apparently decided to leave out a few important details.

Sale 1

http://www.tf2outpost.com/trade/23207506 Sold for PE Marauder + 4 keys in items

X = 3.2*0.9 + 0.3*0.9

X = 3.2

Kiss King http://backpack.tf/item/2466236347

Proof of sale http://imgur.com/M1FQmSy

Sale 2

http://www.tf2outpost.com/trade/24279581 Sold with Strange Ghastlierest Gibus for Searing Fruit Shoot + Aussie Blutsauger

Kiss King was offered on Fruit Shoot

X + 0.3 = 0.7 + 2.4

X = 3.1 - 0.3

X = 2.8

Kiss King http://backpack.tf/item/2466236347

Bluts http://backpack.tf/item/3159134006

Shoot http://backpack.tf/item/927067708

Gibus http://backpack.tf/item/42372327

Sale 3

http://www.tf2outpost.com/trade/24281241 Sold for 40 keys pure

X = 3.6

Kiss King http://backpack.tf/item/2466236347

Before Sale http://backpack.tf/profiles/76561198044871940?time=1419321600

After Sale http://backpack.tf/profiles/76561198044871940?time=1419408000

I'm done, no more resuggesting