http://www.tf2outpost.com/trade/9382832 - multiple adds for 5 keys

http://www.tf2outpost.com/trade/8627557 - offered 3 keys + 1.5 in items

http://www.tf2outpost.com/trade/9760119 - offered blood bk flame mk 1 (4-5 keys)

http://www.tf2outpost.com/trade/9776018 - 4 key offer

http://www.tf2outpost.com/trade/9760119 - offered 4 keys

http://www.tf2outpost.com/trade/9801273 - offered to hold on until they collected 4 keys

http://www.tf2outpost.com/trade/8367022 - offered 4 gift wraps (4 keys) - also added for the price of 4 keys

http://www.tf2outpost.com/trade/8271995 - add for 4 keys

http://www.tf2outpost.com/trade/8951768 -offered 4 keys for it

http://www.tf2outpost.com/trade/7244280 - 4 key offer

http://www.tf2outpost.com/trade/8281768 - add for 4 keys (bought from somebody else apparently/but still willing to pay 4 keys)