Sale #1

NO link

Sold for 14 keys + 1.5 keys in items

http://backpack.tf/profiles/76561198133207902?time=1434092400

http://backpack.tf/profiles/76561198133207902?time=1434178800

14+1 = 15

Price: 15 keys

Sale #2

http://www.tf2outpost.com/trade/26134645

sold for 10 keys

http://backpack.tf/profiles/76561198156666695?time=1433919600

http://backpack.tf/profiles/76561198156666695?time=1434006000

Price: 10 keys

Sale #3 - might'e been quicksell

No link

Sold for 9 keys

http://backpack.tf/profiles/76561198163179642?time=1433574000

http://backpack.tf/profiles/76561198163179642?time=1433660400

Price: 9 keys

Support

http://www.tf2outpost.com/trade/26068906 - B/O of 14. Messy inventory history

Taking a final of 10 -15 keys since the 9 key sale doesnt seem very solid. Even if it is included, final average price will only shift by 0.5 keys, which is negligible.