Sellers:

http://www.tf2outpost.com/trade/24220779 12 Keys, young

http://www.tf2outpost.com/trade/24110174 12 Keys, 1 Week unsold

http://www.tf2outpost.com/trade/23858385 13 Keys, 3 Weeks unsold

http://www.tf2outpost.com/trade/24141403 14 Keys, 6 Days unsold

http://www.tf2outpost.com/trade/24222389 14 Keys, young

Sold for a Bubbling Gentleman's Gatsby(12 Keys with Overpay)

http://www.tf2outpost.com/item/440,3038186213,403,5 Sultan's History

http://www.tf2outpost.com/item/440,3039715808,184,5 Gentleman's History

Sold for 11 Keys

http://backpack.tf/profiles/76561198108701981?time=1418763271 -> http://backpack.tf/profiles/76561198108701981?time=1418803200

Two sales, 11-12 Keys should be fine.

Additional Proof/Counter-Proof/Constructive Criticism/Feedback is always appreciated.