Interesting movie.
As far as value. If it he cannot sell it for $3 million, then it is not worth $50 million. It is not worth $3 million. Pricing things out of a book, when reality says otherwise is a fool's game.
Also, anyone that bought this (he is now offering it at $1.5 million) would need a massive Indiana Jones size warehouse to store it.
Finally, from reading the posts about him, it seems that he has no real idea of value. The Rolling Stones album that is worth $5 - $10,000 was recently offered on ebay for $2,000. Many of the more common records may be "worth" $5 each, but you can get them free at yardsales (think Beegees, Carpenters, or Conway Twitty).
Bill