I changed the u to an o, pommel, domo. Of course all of what I suggest is speculation as we can not ask Mohei himself, I saw and owned other katana bako and this is the only one I saw that has wood that was gouged from the end where the tips of the blades were stored, both ends look different and my guess is because of the different ends of the katana. In some photos the ghosting from where the brackets were fastened on the bottom and sides that held the blades in place in the chest are visible, the wood is a lighter colour and there are holes where the nails once were. Most of the interior staining is at the end of the box where the tips of the blades rested, a slip of the hand while cleaning or replacing a katana is a possibility. I believe the 4 hinges that attach the top to the chest were added at some other time, probably not original to 1820 and who knows, could be whoever added the hinges cut themself, there are a number of possibilities for how the blood stains originated, but having lived in Japan I seriously doubt any carpenter or person who worked on the chest/box would have left any kind of staining behind, too sloppy, just doesn't fit the meticulous craftsmanship of the Japanese. But again, I could be wrong on all of this but I'm basing what I write on what I see with my own eyes. There is writing on just about every surface of the chest, it passed through many hands before mine, there are many possible explanations for the stains. Adds to the mystery.