Well minor fix here. Apparently callouts count as proof, and the last suggestor missed one. Mostly using his proof but adding the callout to the high end that he seems to have omitted.

Open Trades:

http://www.tf2outpost.com/trade/13126884

-Hearts Kabuto (5.0-5.5) = 4.8 buds

-Green Black Hole Fr-0 (5.1-6.1) = 5.0 buds

-5.5 buds (This guy has been gone for a while, the offer may be retracted. The reason it's higher than my b/o is because it was my old b/o.) = Invalid offer

http://www.tf2outpost.com/trade/13006990

-"No C/Os, just pathetic lowballs"

Sales:

Copied exactly from the last suggestion:

"Sold for a hearts phantom, current owner - the second trade owner

http://www.tf2outpost.com/item/440,1823111992 (noir history)

http://www.tf2outpost.com/item/440,1823061032 (phantom history)"

Hearts Le Party Phantom (4.5-5.1) = 4.3 buds

Notes:

-Unusual offers and item offers were taken with 90% overpay applied to the average of the range.

-Ranges from offers are rounded to the nearest tenth, and if the second digit is five or above they are rounded up.

-Only sales and offers that have occured in the past month were noted.

Conclusion:

Proof almost identical to this suggestion, http://backpack.tf/vote/id/51fe7fb5ba25362f54000008 , just adding the callout he missed.