http://www.tf2outpost.com/trade/20724265 - Sold for DBD Front Runner (~5.6 buds)

http://backpack.tf/item/2046555650

http://backpack.tf/item/2371430284 - Sold for DBD Tough Stuff Muffs (~11.5 buds)

Most likely an outlier.

http://www.tf2outpost.com/trade/18006239 - Sold for Cloud 9 Yellow Belt (~6.9 buds)

Sale's JUST too old to use as proof, but with these two lower sales, we can identify that the DBD Muffs sale is an outlier.

http://backpack.tf/profiles/76561198046294117?time=1397458800

http://backpack.tf/profiles/76561198046294117?time=1397545200 - Sold for Aus. Grenade Launcher + Aus. Stickybomb Launcher

At the time these were 1.45 and 1.5 buds respectively but this is still a massive outlier.

http://www.tf2outpost.com/trade/21049241 - B/O of 7 buds

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Hoping this suffices. :s