Borrowing a little proof from the last suggestion here.

Having to redo this because of the refined change messing up values.

http://www.tf2outpost.com/trade/13013638

Sold for 2 buds pure

http://i.imgur.com/T6AYwBm.png

http://www.tf2outpost.com/trade/13086530

Looks like he sold for around 2 buds after all and then unboxed at least 43 keys: http://backpack.tf/id/76561198051896774?time=1374994800

http://www.tf2outpost.com/trade/13133037

Sold with Power Surge Swagmans for Disco Beat Down Noble, so much unpriced stuff

http://www.tf2outpost.com/trade/13399563

Sold with Phosphorus Pom Pom for Sulph Flamenco(~12.5) - not sure price on the Phos but this is probably a major outlier

http://www.tf2outpost.com/trade/12412616

Sold for Sulph Rack(~4)

http://www.tf2outpost.com/trade/12382377

Sold for Sulph Strontium Stove(~3.3)

http://www.tf2outpost.com/trade/11589076

Sold with 1 bud for Phosphorus V. Merry(no price)

http://www.tf2outpost.com/trade/11499493

Sold for S. Kritz(~33 keys) + G Fetti Slug(~2) + TS Bills(~7 keys) = ~3.8 buds

Both of those 2 bud sales seem like quicksell prices to me, since there were many sales for higher.