.33 keys = 2 ref

.5 keys = 3 ref

.66 keys = 4 ref

.8 keys = 5 ref

Sold

http://www.tf2outpost.com/trade/14889286 (1 key) qs

Unsold

http://www.tf2outpost.com/trade/15021815 (wot 3.66-4 ref)

http://www.tf2outpost.com/trade/15023461 (1.33 keys, new)

http://www.tf2outpost.com/trade/15018259 (1.5 keys painted lime, new)

http://www.tf2outpost.com/trade/14862906 (1.5 keys, 1 week)

http://www.tf2outpost.com/trade/14957905 http://bazaar.tf/trade/475978 (1.5 keys, 2 days)

http://www.tf2outpost.com/trade/14995092 (1.5 keys, 1 day)

http://www.tf2outpost.com/trade/14489674 (1.66 keys painted greed, 3 weeks)

http://www.tf2outpost.com/trade/14729046 (1.66 keys, 2 weeks)

http://www.tf2outpost.com/trade/14805269 (1.66 keys, 1 week)

http://www.tf2outpost.com/trade/14791861 (1.66 keys, 1 week)

http://www.tf2outpost.com/trade/14957680 (1.66 keys, 2 days)

http://tf2tp.com/trade.php?trade=9831723 (1.66 keys, 2 days)

http://www.tf2outpost.com/trade/14990975 (1.66 keys, 1 day)

http://www.tf2outpost.com/trade/15019902 (1.66 keys, new)

http://www.tf2outpost.com/trade/14760376 (1.7 keys, 1 week)

http://www.tf2outpost.com/trade/15010259 (1.7 keys, 7 hrs)

http://www.tf2outpost.com/trade/14973279 (1.8 keys painted gold, 2 days)

http://www.tf2outpost.com/trade/14380401 (1.8 keys, 4 weeks)

http://www.tf2outpost.com/trade/14624327 (1.8 keys, 2 weeks)

http://www.tf2outpost.com/trade/14727587 (1.8 keys, 2 weeks)

http://www.tf2outpost.com/trade/14847390 (1.8 keys, 1 week)

http://www.tf2outpost.com/trade/14910986 (1.8 keys, 4 days)

http://www.tf2outpost.com/trade/14920071 (1.8 keys, 4 days)

http://www.tf2outpost.com/trade/14944201 (1.8 keys, 3 days)

http://www.tf2outpost.com/trade/14972767 (1.8 keys, 2 days)

http://www.tf2outpost.com/trade/14987171 (1.8 keys, 1 day)

http://backpack.tf/classifieds/search/id/520010a2ba25363a5d000000 (3 at 1.6, 1 at 1.7)