Re-Counter-Suggestion! Some credit to T i t o and d0. I did some changes.

SOLDS

http://www.tf2outpost.com/trade/17654985 Sold for a Collector's Natascha: http://www.tf2outpost.com/trade/17916058 Value in 6 Keys.

http://www.tf2outpost.com/trade/18040888 Sold for 7 Keys pure. He has some Keys from the guy who bought it on his inventory.

SELLERS

http://www.tf2outpost.com/trade/18095256 Selling for 6 Keys, in 2 trades ---> http://www.tf2outpost.com/trade/17879383 So, it's more than 1 day old.

UNSOLDS

http://www.tf2outpost.com/trade/18032531 8 Keys. This prove what something for more than 7 Keys don't sell.

As always, sorry for the bad english, extra-proof is always appreciate, counter-proof is welcome. Comments like "Bad proof, downvote!" aren't useful. If you downvote, explain why. If you upvote, comment that!.