I'm currently living in an unmodded Battlehorn Castle. The other day I placed an enchanted warhammer of mine, "Gladiator's Relief", into the display case in my bedroom. I returned later to find that the hammer was missing, which I wouldn't think much of if it weren't for one strange detail: the lid of the case was open, and I distinctly remember closing it. I know NPCs can pick up weapons, so is there any reason that any of the inhabitants of the castle (I have all upgrades except for dining room and wine cellar so far) would take my hammer?

This is less important, but I also think I found a book on a table that I did not place. On the upper balcony of the Great Hall, at the very back, I found a copy of King that I don't recall putting there (the table was being used to display armour only).