I'm guessing that his family is selling it then, i doubt Lars Ulrich would have it sold if it was in Metallica's possession.
Surely his family are loaded though right? I mean talking about one song, "For Whom The Bell Tolls" was his, and most of "Ride the lightning" has his name on it.
Metallica have sold over 80 million albums according to "Some Kind Of Monster", why would they sell it?