3 ref = .5 keys

4 ref = .7 keys

5 ref = .8 keys

http://www.tf2outpost.com/trade/14598427 (1.5 keys sold)

http://www.tf2outpost.com/trade/14352046 (1.5 keys, 1 week)

http://www.tf2outpost.com/trade/14485387 (1.7 keys, 5 days)

http://www.tf2outpost.com/trade/14592406 (1.7 keys, 16 hrs)

http://www.tf2outpost.com/trade/14348214 (1.8 keys, 1 week)

http://www.tf2outpost.com/trade/14489106 (2 keys painted gold, 5 days)

http://www.tf2outpost.com/trade/14510585 (2 keys painted purple, 4 days)

http://www.tf2outpost.com/trade/13937698 (2 keys painted drab tincture, 4 weeks)

http://www.tf2outpost.com/trade/14170883 (2 keys painted greed, 2 weeks)

http://www.tf2outpost.com/trade/13220761 (2 keys, 1 month)

http://www.tf2outpost.com/trade/13426448 (2 keys, 1 month)

http://www.tf2outpost.com/trade/13354971 (2 keys, 1 month)

http://www.tf2outpost.com/trade/13934735 (2 keys, 4 weeks)

http://www.tf2outpost.com/trade/14067052 (2 keys, 3 weeks)

http://www.tf2outpost.com/trade/13952329 (2 keys, 3 weeks)

http://www.tf2outpost.com/trade/14294207 (2 keys, 2 weeks)

http://backpack.tf/classifieds/search/id/52000c074bd7b8f42500000f (1 at 1.7, 6 at 2)