Sale 1

http://www.tf2outpost.com/trade/24651093 Sold for 10 keys

X = 10

Cone http://backpack.tf/item/802357877

Sale 2

[No OP Trade] Sold for 8 keys pure + Purple Bill's

X = 8 + 0.2*0.9

X = 10 keys

Bill's http://backpack.tf/item/44171107

Cone http://www.tf2outpost.com/item/440,3434164921,435,5 (Was not scanned by backpack.tf)

Keys http://backpack.tf/profiles/76561198051832245?time=1421298190#page2

Sale 3

http://www.tf2outpost.com/trade/23909632 Sold for Nuts SnS

B/O on Cone was 12

B/O on SnS was 15

X = 12 keys (B/O)

SnS http://www.tf2outpost.com/item/440,3265410792,178,5

Dead Cone http://backpack.tf/item/1829378068

Mini for SnS

Not even going to bother, B/O is incredibly lower than outdated current price