Sellers:

http://www.tf2outpost.com/trade/29213671 - b/o: 10 keys (2 weeks)

Sold:

http://backpack.tf/profiles/76561198197516958#!/compare/1496188800/1496275200 - bulk

Credits to Beaser

http://backpack.tf/profiles/76561198160966047#!/compare/1494633600/1495065600 - ?

Credits to Beaser

http://backpack.tf/profiles/76561198085698942#!/compare/1494979200/1495065600 - sold for Planets Bonnet (11) + 1 key + crates = 12 keys (outlier)

Credits to Beaser

http://backpack.tf/profiles/76561198097135729#!/compare/1492819200/1492905600 - sold for 10 keys

Credits to Mindacos

https://marketplace.tf/items/49;5;u29 - sold for $21 = 10 keys

Credits to Mindacos

http://backpack.tf/profiles/76561198036445124#!/compare/1496016000/1496102400 - sold for 9 keys

Credits to Mindacos

Mini’s:

Planets Bonnet:

http://imgur.com/acMNPC5 - b/o: 11 keys

Credits to Beaser

Conclusion:

sales at 9, 10, 10, 12

taking 9-10 keys