first link looks good but I'd say to wait until it has been sold.

second link is buying for 12-16 so that proves nothing

I hate 'buying any... for x' proof, but it gets accepted somehow.

http://www.tf2outpost.com/trade/10663906

offer of sf huntsman (11) + 4 keys, even if you'd deduct one key for item overpay it's 14

http://www.tf2outpost.com/trade/10382374

sold for 15 in items

http://www.tf2outpost.com/trade/10615857

was selling for 14, got added

http://www.tf2outpost.com/trade/10368517

was selling for 15, got added

http://www.tf2outpost.com/trade/10323357

offer of bill's + 8 (16 keys)

http://www.tf2outpost.com/trade/10304481

quicksold for 13

this hat can get over 13 keys it seems