Sellers:

http://www.tf2outpost.com/trade/27368057 - 3.22 - 3 days ago

http://www.tf2outpost.com/trade/27377465 - 3.33 - 1 day ago

http://www.tf2outpost.com/trade/25200740 - 3.66

http://www.tf2outpost.com/trade/27381020 - 3.88 - 1 day ago

http://www.tf2outpost.com/trade/27341981 - 4 ref - Sold

Buyers:

http://www.tf2outpost.com/trade/26797711 - 3.33

http://www.tf2outpost.com/trade/27017327 - 3.33

Classifieds: http://imgur.com/I09rMCe | http://imgur.com/ToYkyFk | http://imgur.com/kbDhsD8

Sellers: 1x @ 3 ref | 4x @ 3.33 ref | 10x @ 3.66 ref

Buyers: 2x @ 3.33 ref | 4x @ 3 ref

3.66 ref comes from the sellers on Classifieds, whereas 4 ref is from the sale that I found. Not including 3.33 ref due to the buyers on classifieds and a buyer on Outpost. Conservative drop! ^_^