Sales

http://www.tf2outpost.com/trade/24450035 - offered along with 14 keys pure on aces pullover ~8 = ~7

http://www.tf2outpost.com/trade/24479132 - offered in a bulk deal for beams surgeon's shako (unpriced and unpriceable)

http://www.tf2outpost.com/trade/24071478 - sold for ghosts beak ~8 + bliz cosa ~1.65 + arcana mongolian ~2.3 = ~11.95*0.9 = ~10.7

http://www.tf2outpost.com/trade/24310541 - sold for hellfire AA ~7.5 + screaming tiger fresh brewed ~3.5 = ~11*0.9 = ~10 ( http://backpack.tf/profiles/76561198066195760?time=1419926400 )

http://www.tf2outpost.com/trade/24691963 - sold for duped aces KE ~5 + 4.5 pure = ~9

Sellers

http://www.tf2outpost.com/trade/24694347 - 9 B/O

http://www.tf2outpost.com/trade/24546200 - 9 B/O

http://www.tf2outpost.com/trade/24705680 - 10 B/O

Sales at 7, 9, 10, 10.7. Considering current B/Os, I suppose that 10.7 is a bit too high whereas 7 feels really low. I find 9-10 reasonable enough here.

Arcana mongolian:

http://www.tf2outpost.com/trade/24075296 - sold along with 3 painted bills (~1) for stormy modest ~3.65*0.9 = ~3.3 - 1 = ~2.3 ( http://backpack.tf/profiles/76561198063500219?time=1418245494 ~ http://backpack.tf/profiles/76561198049748674?time=1418281749 )

Screaming tiger fresh brewed:

http://www.tf2outpost.com/trade/23396725 - sold for 3.5 pure

Duped aces KE:

http://www.tf2outpost.com/trade/24497776 - sold for GE FFF ~5.6*0.9 = ~5.1

Considering multiple B/Os at 5 for duped aces KE, I'll take it as a price