http://www.tf2outpost.com/trade/8168598 - "quicksell" 16 keys

http://www.tf2outpost.com/trade/8069156 - paid nutz beanie + 5 keys sweets? (NOTE: both owners seemed to be ignorant of the discontinuing of the beanie, Wide-eye later mentioned that any offer above 15 keys on the beanie should add him. add that to the ?5 keys sweets? and you have a ~20-21 key sale)

http://www.tf2outpost.com/trade/8048333 - 22 key buyout, but sold to wide-eye ^. At the time wide-eye was buying "quicksale" unusuals with 18 keys, so we can assume it sold somewhere in between 18 & 22 keys

http://www.tf2outpost.com/trade/8038872 - sold flies sultan (21 keys in unusual but outdated)

http://www.tf2outpost.com/trade/7957407 - 19 key b/o

http://www.tf2outpost.com/trade/8246004 - sold 14 keys + 10 refined (~17 keys)

http://www.tf2outpost.com/trade/8265532 - 20 key buyout

Conclusion: High end from 19 key buyout, 20 key buyout and 18-22? key sale

low end from 16 & 17 key sale.