No protection master of the restoration that was done in the 1990s was done for the original, so no there is no archival print to offer to LOC. What they have is the original copyright submission for each of the films.
I still can’t believe 20th Century Fox did not protect its investment by making sure a restored copy of the original was made. But we know one was not done, the negative cutter/editor was ready to order a new print and Lucas stopped him.