Sales:

http://www.tf2outpost.com/trade/21073247 - sold for haunted bonk boy ~10*0,9 = ~9

http://www.tf2outpost.com/trade/21034563 - offered noble + haunted beanie ~2 for power surge dapper's ~3.6 + clean max ~3 + spec aussie RL ~2.9 = ~9.5 - 2 = ~7.5

http://www.tf2outpost.com/trade/21059481 - offered noble for dbd rebel ~4.2 + 3 keys = ~4.5 ( http://backpack.tf/profiles/76561198035145963?time=1405093181 ) - seems like an outlier or some cash was involved here

Haunted bonk boy mini:

http://www.tf2outpost.com/trade/21074258 - sold for 13th hour ye olde baker ~6 + PS slope scoper's ~4.7 = ~9.6 (slope scoper's price is a bit outdated, but none on the market currently, therefore no tracable sales except this one and its price isn't really old)

http://www.tf2outpost.com/trade/18625073 - sold for scorching tree ~7*0,9 = ~6.3 + 4 buds pure = ~10.3

http://www.tf2outpost.com/trade/20648457 - sold for aussie scatter ~2*0,9 = ~1.8 + 8 buds pure + sweets = ~10

Range 9.6-10.3