Sale 1

http://www.tf2outpost.com/trade/24721023 Sold for 15 keys pure http://puu.sh/eUYv7/46e891d249.png

X = 15 keys

Tricorne http://backpack.tf/item/254481340

Keys http://backpack.tf/profiles/76561198072297252?time=1422027896#page0

Sale 2 Both pure sales went fairly quickly, calling this an outlier

http://www.tf2outpost.com/trade/24576381 Sold for Bubbling Batter's

Tricorne was offered

X = 13 keys

Batter's http://backpack.tf/item/1402603718

Tricorne http://backpack.tf/item/254481340

Mini for Batter's

http://www.tf2outpost.com/trade/24275256 Sold with a key in sweets for Bubbling Hottie's

Hoodie had a B/O of 14

Hoodie trade had substantially more views than Batter's, presuming offered

X + 1 = 14

X = 13 keys

Hoodie http://backpack.tf/item/646688697

Helm http://backpack.tf/item/1173138244

Sale 3

[No OP Trade] Sold for a bud pure

X = 1 (15 keys)

Bud http://backpack.tf/item/244203416

Tricorne http://backpack.tf/item/286567378