Below current range:

http://www.tf2outpost.com/trade/14790860 - Bought at least one @ 3.5 keys

http://www.tf2outpost.com/trade/14979783 - Sold for 3.8 keys

http://www.tf2outpost.com/trade/14982334 - Sold for 4 keys

http://www.tf2outpost.com/trade/14981901 - Sold for 4 keys

http://www.tf2outpost.com/trade/14944952 - Sold for 4 keys

http://www.tf2outpost.com/trade/14955936 - Selling for 4 keys (untradeble until tommorow)

http://www.tf2outpost.com/trade/14860057 - Sold for 4 keys

Unsolds at current range:

http://www.tf2outpost.com/trade/14950613 (1 day)

http://www.tf2outpost.com/trade/14844922 (6 days)

http://www.tf2outpost.com/trade/14918454 (2 days)

http://www.tf2outpost.com/trade/14968701 (18 hours)

http://www.tf2outpost.com/trade/14939113 (1 day)

Any comment, additional proof or critics is appreciated. This is my first suggestion

And here's 3 more selling @ 4 keys:

http://www.tf2outpost.com/trade/14990824

http://www.tf2outpost.com/trade/14984969

http://www.tf2outpost.com/trade/14984113