I just easily sold 5 of them in 1 day at 1 key + 1.66. Easily a 1.5 key price tag on these. http://www.tf2outpost.com/trade/8312166

More proof to come after I eat. Just posting this now before I forget...

Selling:

5.33 (roughly 1.5 keys): http://www.tf2outpost.com/trade/8320158

Mutiples selling at 2 keys. Not enough interest to include in price.

Sold:

http://www.tf2outpost.com/trade/7640812 - Over 2 keys in items.

http://www.tf2outpost.com/trade/6669616 - Sold a couple at 2 keys, multiple 5 ref offers turned down.

http://www.tf2outpost.com/trade/8168806 - 1.5 keys

http://www.tf2outpost.com/trade/8257596 - 1 key + 1.66

Offers:

http://www.tf2outpost.com/trade/8243472 - 4.33 offer not taken.