Ugh, minis.

Sale 1: Sold with 3 keys for Strange Australium Ambassador[17 keys]+Green Confetti Bombing Run[12.5 keys]

http://backpack.tf/profiles/76561198066917480/#!/compare/1458864000/1458950400

17+12.5=29.5

29.5-3=26.5 rounding to 27 keys

Sale 2: Sold for 18 keys

http://backpack.tf/profiles/76561198084166572/#!/compare/1458284400/1458716400

Seller

http://www.tf2outpost.com/trade/27973222 22 keys for 1 week

So I have sales at 18 and 27, also have a seller at 22 keys. Due to the seller, I'll call 27 the outlier. Making this 18 keys flat.