Remember, the only reason we can still watch the highly influential 1922 vampire movie Nosferatu today is because some people didn't destroy all their copies despite a court saying they had to.
The author in question here was pretty shitty. He wrote his own sequel to called "Fellowship of the King", and then sued Amazon and the Tolkien estate saying they stole elements from his book. He lost, and the Tolkien estate countersued.
The guy played stupid games and won stupid prizes.
Even with several details altered, Stoker's heirs sued over the adaptation, and a court ruling ordered all copies of the film to be destroyed. However, several prints of Nosferatu survived, and the film came to be regarded as an influential masterpiece of cinema and the horror genre.
Some older dutch movies were released as rentals to the theaters that had to be returned after they stopped playing the movie. These copies were all destroyed and re-releases on DVD now look worse than what it looked like in movie theatres.
The good news is that some theatres hung on to some movies.
I don't know how many might be still be around, but I know for a couple of movies where they are. I don't think they have been properly archived and/or converted to digital media yet. I would like to see if there are people in The Netherlands that can do these things and if the current owners of the rolls of film are willing to.