Sales:

http://www.tf2outpost.com/trade/27638662 - 15 Keys - http://i.imgur.com/NjW04BE.png (4 Days ago)

~~~ I also received a trade offer for 15 Keys Pure within the first day of the trade but missed it while checking rep on phone :(

http://www.tf2outpost.com/trade/27619413 - Possible sold for 14 Keys (5 Days ago)

~~~ http://backpack.tf/profiles/76561198072063595?time=1451894400&compare=1452325742 ???

Possibly trade held - http://backpack.tf/profiles/76561198072063595?time=1451894400&compare=1451980800

Sellers:

http://www.tf2outpost.com/trade/27674692 - 16 Keys (Black Paint) - Young

Conclusion:

Giving the benefit of the doubt and say the 14 Key sale is valid. 2 Recent sales, no valid sellers, taking a range of 14-15 Keys.