Credits to Marty Birdman for correcting my sales.

Sold for 18 Keys

http://backpack.tf/profiles/76561198101441279/#!/compare/1454400000/1454832000

http://www.tf2outpost.com/trade/27622993

Sold for an Australium Spec KS Stickybomb Launcher(~19 Keys at the time) and 2 Keys(21 Keys total)(B/O was 20)

http://backpack.tf/profiles/76561198042269636/#!/compare/1455091200/1455177600

http://www.tf2outpost.com/trade/27766055

Sold for a Cloud 9 Gym Rat(16.5 Keys, rounding to 17)

http://backpack.tf/profiles/76561198131115320/#!/compare/1458630000/1458716400

Quicksold for 15 Keys

http://backpack.tf/profiles/76561198079743750/#!/compare/1459036800/1459296000

http://www.tf2outpost.com/trade/28019235

Sales seem to fit, 17-20 Keys should be fine.

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