This one:

http://www.tf2outpost.com/trade/10930267

SOLD for 13 pure

This one:

http://i.imgur.com/BLxNeGL.png

SOLD for 3 buds, 3 keys, scorching Milkman, ghost trophy belt, + sweets (~11)

Buyer:

"I paid for mine with a scorching milkman, haunted ghosts trophy belt, 3 buds, and sweets, which I feel was a slight quicksell, since the previous owner of my veil was a friend and wanted a scout/sniper hat and some pure."

http://www.tf2outpost.com/trade/11728141

-10 pure

-Purple energy anger + vivid stahlhelm (~12)

That's all the data I got, but 2 sales and recent similar offers seem to confirm this range.