Proof below. 4 month-old price.

Using this for the ks wraith

Sales:

http://www.tf2outpost.com/trade/17195759

-waxy bought beams waxy+blizz chapeau (both outdated)+10 keys in sweets: http://www.tf2outpost.com/trade/8182082

-~10.3 buds

http://www.tf2outpost.com/trade/16997156

-bought eerie veil (never properly priced)=~8.7 buds but it's actually much higher

http://www.tf2outpost.com/trade/15469520

-b/o of 18 buds

-sold for roboactive modest scrap=~10.4 buds

http://www.tf2outpost.com/trade/15645990

-b/o of 15 buds on another trade

-sold for clean burning phantom+2 buds+1 key+small sweets ( http://www.tf2outpost.com/trade/15569690 )

-buyer's bp:

http://backpack.tf/id/76561198043106792?time=1384156800

http://backpack.tf/id/76561198043106792?time=1384243200

-99% sure he added the 2 buds to the phantom

1. the only other sale between the histories was what he sold the waxy for and I doubt he added for that

2. jojo's b/o for the waxy was 15 and the phantom's was 13, people don't sell for less than what their hat's worth and that is a 2 bud difference

-~11.7 buds

http://www.tf2outpost.com/trade/15682337

-wanted ~15 buds

-sold for beams western+planets bonk+cloudy trilby seen in the history above

-~11.7 buds

Current trades:

http://www.tf2outpost.com/trade/17757527

-wants 12 buds

http://www.tf2outpost.com/trade/15689449

http://www.tf2outpost.com/trade/17558916

-b/o of ~15-16 buds in cash

Sales: 8.7, 10.3, 10.4, 11.7, 11.7

8.7 is out of the question and that eerie veil is totally off anyway. 10.3 and 10.4 are around ~10.5 while 11.7s are ~11.5 just to make the numbers nicer, and doesn't really affect value.