Proof below.

Sales:

http://www.tf2outpost.com/trade/14319994

-b/o of $150 paypal (~4.3 buds) on another trade

-seems to have sold for of hwnn+1 bud+18 keys seen here: http://www.tf2outpost.com/trade/14976499

-3.3 buds

http://www.tf2outpost.com/trade/14291218

-b/o of 4 buds

-seems to have been bought for 3 buds+1 key seen here: http://www.tf2outpost.com/trade/14082265

-~3 buds

http://www.tf2outpost.com/trade/12876113

-b/o of 4 buds

-was bought for 2 buds+22 keys here: http://www.tf2outpost.com/trade/13253014

-~3 buds then

Current trades:

http://www.tf2outpost.com/trade/14954896

-offers, level 100

http://www.tf2outpost.com/trade/13279534

-b/o of 4.5 buds, 2 months old

Sales: 3, 3, 3.3

Low end is from 2 sales at 3 and high end is from the sale at 3.3.