This is absolutely not worth it, 13k for a film print is insane. Only place that gets anywhere near that amount of money is thestarwarstrilogy forum and even then this is a ludicrous price.
Has a print like that ever surfaced? To my knowledge no. Making it rare.
Out of curiosity what would you consider to be reasonable for something like that? Maybe the seller would accept a 5K offer if that is reasonable? I don’t know much about purchasing prints like that. So enlighten us.