Some of your posts have made them think quite a bit Alex. I recently did my own research on a blade, only because I was already given a lead on who the smith was. But then the smiths oshigata appeared in a well known book. The wakizashi was mumei, so it couldn't be gimei. And everything from type of hamon, to yasurime matched !. Luckily the hamon was unique to that particular school and one other.
Oshigata books in Japanese which aren't translated which the NBTHK use, potentially have a huge impact If used in the west. But yes we can't issue papers.
But aren't papers only important to people who don't plan to keep the sword forever?? Or is it a satisfaction of an authority saying "yes ,the sword is that ".
Regards