investigator will be able to get copies of documents from the her party. you are not allowed to directly request documents from the other party at this point.
it is your responsibility to tell the investigator about any documents or files that may help your case. sweet potatoes.
just offhand i don't think it would work quite the same way - the texture of the cooked potato is quite different, and so i don't think it would hold together as well.
having said that, it would be awesome if you tried it and it actually worked, and of course you reported back! 