Looks like this hat has lost almost all interest. Lots of them on OP for 6 keys but are neglected. Even the ones at 5 keys don't seem to get any attention. Trades looking for offers are largely ignored.

http://www.tf2outpost.com/trade/8451114 (Buying for 6 keys so there is still "demand". He is not buying anymore though)

http://www.tf2outpost.com/trade/8497522 (1 hour. 6 keys, 1 gold painted. Unsold)

http://www.tf2outpost.com/trade/8451710 (2 days. 6 keys. Unsold)

http://www.tf2outpost.com/trade/8458802 (1 day. 6 keys. Unsold)

http://www.tf2outpost.com/trade/8496599 (1 hour. 6 keys Unsold)

http://www.tf2outpost.com/trade/8474073 (1 day. 6 keys. Unsold)

http://www.tf2outpost.com/trade/8332705 (1 week. No offers)

http://www.tf2outpost.com/trade/8496231 (2 hour. 5 keys. Unsold Sold)

http://www.tf2outpost.com/trade/8491606 (6 hours. 5 keys. Unsold)

http://www.tf2outpost.com/trade/8489412 (8 hours. No offers)

http://www.tf2outpost.com/trade/8471245 (1 day. No offers)

http://www.tf2outpost.com/trade/8471363 (1 day. 6 keys. Unsold)

http://www.tf2outpost.com/trade/8482690 (17 hours. No offers)

http://tf2tp.com/trade.php?trade=9116453 (6 keys for a pink painted one)

http://tf2tp.com/trade.php?trade=9115909 (For a vintage stash - 5 - 6 keys on bp.tf)