Sold for 5 keys

http://www.tf2outpost.com/trade/4715129

http://www.tf2outpost.com/trade/6264000 (1 unsold, I believe, but the other went out for 4 keys + 3 ref)

Open trades selling for 5 keys

http://www.tf2outpost.com/trade/6280213

http://www.tf2outpost.com/trade/6300726

http://www.tf2outpost.com/trade/6270396

http://www.tf2outpost.com/trade/6307412

http://www.tf2outpost.com/trade/6195841

http://www.tf2outpost.com/trade/6293089

http://www.tf2outpost.com/trade/6290578

http://www.tf2outpost.com/trade/6306107

Multiple offers of 5 keys in this one. No idea why he didn't take one of 'em and run.

http://www.tf2outpost.com/trade/5947566

This one didn't have a 5 key offer, although someone did offer something worth around 5 keys (Festive Minigun)

http://www.tf2outpost.com/trade/6171905

In conclusion, the upper price limit for this beautiful misc is outdated a bit due to the amount of sellers for 5 keys. While there may be a lot of open trades for them out there, people seem to be happy with 5 keys. I'm not suggesting a range of 4.5-5 keys since anything lower than 5 seems to be snatched up quickly (http://www.tf2outpost.com/trade/6177358).