Sellers:

http://www.tf2outpost.com/trade/22082405 17 Keys

Solds:

Sold for 15 Keys

http://www.tf2outpost.com/trade/21719189

Sold for 14 Keys

http://www.tf2outpost.com/trade/20256250

Sold for a Nuts & Bolts Dark Falkirk Helm(16 Keys with Overpay)

http://www.tf2outpost.com/item/440,2876370981,779,5 Liquidator's History

http://www.tf2outpost.com/item/440,2878213490,30357,5 Dark Falkirk History

It's clear that 17 doesn't happen anymore, 14-16 should be fine.

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