Crappy hat, but, I guess some people really want it.

http://www.tf2outpost.com/trade/10246897 - 1 bud offer, SF Huntsman (11 keys), 16 keys, 17 keys, (OP seems like he may have taken 17 keys)

http://www.tf2outpost.com/trade/10464990 - 20 key offer, offered entire BP including Steaming Tricorne (about 20 keys total)

Just for reference:

http://www.tf2outpost.com/trade/10609438 - Fresh posting (less than day), no offers yet.

http://www.tf2outpost.com/trade/10616163 - Fresh posting (less than day), no offers yet.

http://www.tf2outpost.com/trade/10577962 - Only offered in set, hard to gauge.

http://www.tf2outpost.com/trade/10619695 - Offer of 12 keys, then the rest is just talking about backpack.tf ... weird