3 in existence, 1 currently on the market.

Sales:

1. http://www.tf2outpost.com/trade/19383079

5 pure

2. http://www.tf2outpost.com/trade/19389204

http://www.tf2outpost.com/trade/19606128

http://www.tf2outpost.com/trade/19606558

burning shako (4.1 with overpay) + s.f. force a nature (0.1) + ~ a bud (tricky one to explain) ~5.2

http://backpack.tf/profiles/76561198055026049?time=1399100400

http://backpack.tf/profiles/76561198055026049?time=1399186800

so we go from the robo attendant to the planets crones and the dp hwnn in 1 day. the burning shako + fan got sold for the crones, that can be seen by the outpost histories. the hwnn came from this trade: http://www.tf2outpost.com/trade/19589532 where splief offers a bud and sweets. the most likely explanation for the appearance of a bud pure in his backpack? it was added to the shako and force a nature.

http://backpack.tf/item/193267777 and there it is, after chasing it up through a few trades.

3. http://www.tf2outpost.com/trade/14494101

http://www.tf2outpost.com/trade/18899718

http://www.tf2outpost.com/trade/18929295

sold w/ stormy 13th wraith (14) for a killawatt ke (20.5). after overpay the ke is ~18, puts the attendant at about 4. not the best measure of the value of the hat given the nature of the trade, seems like an outlier.

4. http://www.tf2outpost.com/trade/19234983

http://backpack.tf/profiles/76561198055026049?time=1398063600

seems to have sold for a s.f. nade, steaming mining, steaming fez, stormy big chief, all duped (lol), and a stormy wraith. not all those are in date but it looks like it ends up at well over 7, approaching 8. a pretty big outlier judging from the sales I've found.

That's all the recent trades I can find, any additional proof is welcome.