Using item histories :/ Resuggestion with solds?

Click on the Unusual on TF2 Outpost. It will give you a history of owners. Find out what items the Ushanka were traded for. For example, Using the history of one, we find one of the previous trades: http://www.tf2outpost.com/trade/21022878 . Note that it was traded from Beejay to Jiggy. Now, look at this: http://www.tf2outpost.com/trade/21199317 . It was traded to Jiggy from Beejay, thus we can conclude that the Guten (plus maybe a few miscellaneous items) was traded for the Ushanka. It's not always so cut and dry (F'instance, the Guten is unpriced, so it can't be used as a valid trade by bp.tf standards), so I recommend looking at other Unusual price suggestions for help.