2 months old price and there are sales for less than the current 4 keys flat. [Proof below] There is just over 1 page on OP

Sales for less than 4 keys

http://www.tf2outpost.com/trade/11111750 - 3 keys with strange parts

http://tf2tp.com/trade.php?trade=9562589 - 3 keys

http://www.tf2outpost.com/trade/12881829 - 3.47 keys (adding 3 ref for 4 keys)

http://www.tf2outpost.com/trade/12946915 - 3.5 keys

http://www.tf2outpost.com/trade/12913893 - 3.6 keys

http://www.tf2outpost.com/trade/11618123 - 3.66 keys

http://www.tf2outpost.com/trade/12962954

http://www.tf2outpost.com/trade/12032843 - 3.7 keys

http://www.tf2outpost.com/trade/12879858 - 3.75 keys

Sold for 4 keys

http://www.tf2outpost.com/trade/12818880

http://www.tf2outpost.com/trade/11914765

http://www.tf2outpost.com/trade/12304452

http://www.tf2outpost.com/trade/12819440

http://www.tf2outpost.com/trade/12445412

http://tf2tp.com/trade.php?trade=9608452

http://tf2tp.com/trade.php?trade=9545153

http://tf2tp.com/trade.php?trade=9524925

http://tf2tp.com/trade.php?trade=9516196

http://tf2tp.com/trade.php?trade=9509980

http://tf2tp.com/trade.php?trade=9505147

That's all!

I've put the low range as 3.5 as it accounts for all of the prices apart from the two at 3 keys which I find to be a bit of a quick sell.

Feedback is appreciated as usual!

Thanks!