Proof below. 5 month-old price.

Sales:

http://www.tf2outpost.com/trade/14976113

-sold for 43 keys=~2.4 buds then

http://www.tf2outpost.com/trade/16641199

-wanted 3 buds

-sold/bought for ghosts marauder (outdated): http://www.tf2outpost.com/trade/16763783

-2.9 buds

http://www.tf2outpost.com/trade/16496020

-sold/bought for the above terror baker (unpriced)

-using kaw this would be 2.8 but not using anyway

http://www.tf2outpost.com/trade/12744223

-b/o of 3.2 buds

-sold for stormy guad+bubbling ushanka (outdated)+sweets: http://www.tf2outpost.com/trade/15998893 + http://www.tf2outpost.com/trade/15918966

-~2.9 buds

Sales: 2.4, 2.9, 2.9

Pretty sure these are all the recent sales.