Pizza Parrot and the Butterbean Bunnies is a rare book.
Shaggy Rogers checked it out of the Coolsville Public Library and then lost it in a hole, buried beneath Scooby-Doo's dog bone collection. Incidentally, the library had closed down afterwards so he wouldn't have been able to return it anyway.
A Pup Named Scooby-Doo
It had become a rare book and Bernice Binder wanted to get it, so she dressed up as the Ghost of Mrs. Shusham, the old librarian. It was then dug up by Scooby, and Bernice was unmasked and arrested. What became of the book after that is unknown.