I once found a book years when moving, after I had denied loosing it
I also had to take a book back to the library that has been set a light by a tour guide in Morocco by accident as I had spilled brandy on it and he was trying to dry it over an open flame. YEs he had not thought that one out.
I was more than happy to pay for a replacement (which i did ) but the library did not see the funny side of it
The best way never to have a book back late is to read a short story by Stephen King called the librarian. you will NEVER be late back with a book EVER again!