Sellers:

http://scrap.tf/items?bot=13 3 unsold at 11 keys

http://www.tf2outpost.com/trade/9729446 unsold at 11 keys

http://www.tf2outpost.com/trade/9718723 unsold at 11 keys

http://www.tf2outpost.com/trade/9676057 unsold at 11 keys

Buyers:

http://scrap.tf/items?bot=13 3 bought at 9-10 keys each

http://www.tf2outpost.com/trade/9471156 1 offered for 11 keys 4 days ago

http://www.tf2outpost.com/trade/9574623 1 offered for 11 keys a day ago

http://www.tf2outpost.com/trade/9512694 1 offered for 10 keys & 2 refined 2 days ago

http://www.tf2outpost.com/trade/9574623 1 offered for 10 keys 4 days ago

http://www.tf2outpost.com/trade/9574623 1 offered for 10 keys 2 days ago

http://www.tf2outpost.com/trade/9646500 1 offered for 10 keys 14 hours ago

http://www.tf2outpost.com/trade/9262781 1 offered for 10 keys 14 hours ago

http://www.tf2outpost.com/trade/9646500 1 offered for 10 keys 12 hours ago

http://www.tf2outpost.com/trade/9546446 1 offered for 10 keys 5 hours ago