Resubmitting. Surprisingly only 2 on outpost..both got some offers above current range, let's get to trades:

http://www.tf2outpost.com/trade/8219423 old 19 keys offer

http://www.tf2outpost.com/trade/10370633 full 2011 festives set (~18keys), 16 keys offer, 2x 15 keys offer all rejected

http://www.tf2outpost.com/trade/10731824 wanted 23 keys for whoopie + white ea, we can only assume if sold

http://www.tf2outpost.com/trade/10668781 sold for 16 keys in few hours

3 months price.

Low end - sold for 16, another guy rejected 16 pure keys

High end - 2011 festive set offer (~18 keys) month ago they were worth a little bit more