The ones that were originally here were damaged during whatever struggle took place here; they didn't have an objection to the books themselves.

[ Stated as fact as he opens up a book from the top of one of the stacks. ]

I wonder if these are recreations of the same books that were here before or if it's a new selection... either way, these books look new rather than like someone tried to clean them up after they were damaged. If the Cat is creating everything here, maybe she can only make so many at a time...?