Well that 3 week old trade has "gone till the 22nd" in his name, which might be part of why its unsold, but still most likely valid anyway.

http://www.tf2outpost.com/trade/16160576 Is no longer in his backpack and has a different item history. Also Has 2 willing buyers, the newer one already bought from http://www.tf2outpost.com/trade/16415386 (price unknown)

From that link's item history, we can see it was sold to http://www.tf2outpost.com/trade/16233482 who also appears to have sold it for 2.66. Trail stops there.

http://www.tf2outpost.com/trade/16077301 Isnt online very often, last online 4 days ago, but I'll still say its valid.

Thats all I can find. Not really enough to be "counterproof", so I'm still going to upvote for now.