Proof below.

Sales:

http://www.tf2outpost.com/trade/15240151

-sold for nnb pipe+2 keys=~2.1 buds

-buyer's bp:

http://backpack.tf/id/76561198058616737?time=1382425200 nnb pipe+22 keys

http://backpack.tf/id/76561198058616737?time=1382598000 o.f. hat of cards+2 keys

http://www.tf2outpost.com/trade/14891132

-b/o of 3 buds

-seems to have sold for this miami steel shako (unpriced): http://www.tf2outpost.com/trade/15141578

http://www.tf2outpost.com/trade/14872616

-wanted ~2.8 buds

-sold/bought for this mem leak bunsen: http://www.tf2outpost.com/trade/14780183

-2.4 buds

http://www.tf2outpost.com/trade/14774177

-b/o of 5.5 buds

-had supposed c/o of 2.4 buds

-seems to have sold for genuine robo-sandvich alone=~3.6 buds, looking at the other b/os this is an outlier

Current owner:

http://www.tf2outpost.com/trade/15240665

-offers

Sales: 2.1, 2.4, 3.6

These are all the sales for this hat. High end from sale at 2.4 and supposed c/o. Low end from first sale at 2.1. Unusual overpay and original prices used.