2 month old price, all self-made keys are equal. Clean sales only.

http://www.tf2outpost.com/trade/18010423

-Looking to buy one w/ c9 Milkman (~3.2, 3 month old price) + 1 bud or c9 whopee cap and offers, if that helps at all.

http://www.tf2outpost.com/trade/16978817

http://backpack.tf/id/76561198057179499?time=1391155200

-Sold for 4 buds, 4/5 buds history matched up.

http://www.tf2outpost.com/trade/16013067

http://backpack.tf/id/76561198072946461?time=1385884800 --> http://backpack.tf/id/76561198072946461?time=1385971200

seller's bp:

http://backpack.tf/id/76561198053212280?time=1385971200

-Sold for 2 buds and 37 keys (4 buds) 3 months ago.

http://www.tf2outpost.com/trade/18351724

-B/O 4, unclear sale. Has been offered 3.5 pure --> http://www.tf2outpost.com/trade/17350245

That's all I found. :/

Feel free to counter / support my proof. Vote based on proof presented, not blindly!