I love it when this happens.

MiniSale 1

http://www.tf2outpost.com/trade/24503654 Sold for 2 buds pure

B/O for Milkman was 2.1

X = 2

Milkman http://backpack.tf/item/552787267

Bud 1 http://backpack.tf/item/100425149

Bud 2 http://backpack.tf/item/92432089

MiniSale 2

http://www.tf2outpost.com/trade/24620303 Sold for Aussie Medi-Gun + Angel of Death + SF Bonesaw

B/O for Milkman was 3

Medi-Gun had no trade, presuming offered

X = 2.2*0.9 + negligable amount

X = 2

Milkman http://backpack.tf/item/552787267

Aussie Medi was sold for keys before I could get its item link ;-;

Sale 3

[No OP Trade] Sold for 26 keys pure

X = 2

Milkman http://backpack.tf/item/552787267

Before Sale http://backpack.tf/profiles/76561198036010622?time=1419926400#page0

After Sale http://backpack.tf/profiles/76561198036010622?time=1420012800#page0

Ok I'm starting to think 2 is a key value here...