I would not paper anything that you have a good idea of the provenance of. I have learned over the last few years of my study that papers are just educated guesses on the attribution of the piece and are relatively worthless as a value added addition to an item. Many times, different appraisers provide different attributions, thusly nullifying the effort and burning your $$.
An example below. I know this is Owari Kinko. If i send it to get papered, it will come back and Tokubetsu Hozon to Owari Kinko. Now the question is, why would i spend $250 to paper it?