counter suggestion

~~~~~~~~~~Sellers~~~~~~~~~~

http://www.tf2outpost.com/trade/18173923 4 Keys

http://www.tf2outpost.com/trade/18137530 4 Keys

http://www.tf2outpost.com/trade/18206141 4 Keys

http://www.tf2outpost.com/trade/17953255 4 Keys

http://www.tf2outpost.com/trade/18182773 4 Keys

~~~~~~~~~~Unsolds~~~~~~~~~~

http://www.tf2outpost.com/trade/18190673 1 Day

http://www.tf2outpost.com/trade/16940082 1 Month

http://www.tf2outpost.com/trade/17606240 3 Weeks Might have sold?

http://www.tf2outpost.com/trade/18187588 1 Day

http://www.tf2outpost.com/trade/18191473 1 Day

http://www.tf2outpost.com/trade/18118036 3 Days

http://www.tf2outpost.com/trade/17739907 2 Weeks

http://www.tf2outpost.com/trade/18160916 2 Days, Seems poorly bumbed

http://www.tf2outpost.com/trade/17831021 2 Weeks

This prove 5key very hard to sell for and 4key quite possible

~~~~~Sold for > 4key~~~~~

http://www.tf2outpost.com/trade/18205568

sold 4keys 4ref

http://www.tf2outpost.com/trade/18176020

sold 4keys 3ref

http://www.tf2outpost.com/trade/18175527

sold 4.5key

http://i.imgur.com/bpTZBuh.jpg

sold 4key 3ref

http://prntscr.com/2vjvxz

sold 5key (outlier)

More proof to come!

Conclusion - 4.5keys quite possible