Resuggesting based on TriAsian's help.

Third time is the charm

http://backpack.tf/vote/id/531e9add4dd7b85f2c8b4568

Previous owners have sold around 17.5-30 keys including me.

http://i.imgur.com/U5m7Kbu.png my purchase of this hat (milk man, blizzardy storm)

1.5 buds

http://i.imgur.com/04Pt8Em.png (ℓє iMan S>Unusual #EXAM's trade of the data mining hat for an Smoking private eye http://www.tf2outpost.com/trade/17829335)

1.3 buds

http://i.imgur.com/ybxEJLO.png (たわけ's word that he sold it for an Orbiting fire Birdcage)

17.5 keys

http://imgur.com/UNPMfK9.png item history puts the date of this trade at around a day ago. http://backpack.tf/item/2118241139

(Arc was actually mistaken and actually did a 1:1 trade with luna: http://imgur.com/zhRRs9Y)

17 keys