Re-suggesting because it should be 15 flat (as shown by polar but it was the case of "close enough")

Proof:

Sellers:

http://www.tf2outpost.com/trade/22858348

Solds:

http://www.tf2outpost.com/trade/22607578 (around 15 keys, proof: http://i.imgur.com/mzwK63H.png AND WHAT EXACTLY SOLD FOR http://i.imgur.com/vWq2iGV.jpg )

http://www.tf2outpost.com/trade/22574981 (sold for a Bubbling Furious Fukaamigasa, with cheapest seller on classifieds at 15 Keys)

http://www.tf2outpost.com/trade/22777733 (one of these sold for a hive minder? Polar? Polar just said "Another sale at 15 ~ and linked that link lol)

http://www.tf2outpost.com/trade/22621936 ( the sellers chat with me: stormy storm bombing run (painted black) the square dance (think it was 1 key back then) flipping awesome (also 1 key) and a killstreak festive sniper with halloween spell on it, which later sold for 4 keys, the items not the unusual, unusual worth ... 14 keys? Outdated price. This is probably an outlier)

Thanks again