The following is the response from the Library of Congress' librarian Zoran Sinobad:
"While both STAR WARS (1977) and THE EMPIRE STRIKES BACK (1980) are on the National Film Registry, the Library has not yet acquired new prints of either one. When the request was made for STAR WARS, Lucasfilm offered us the Special Edition version. The offer was declined as this was obviously not the version that had been selected for the Registry. We have not yet requested a print of THE EMPIRE STRIKES BACK, added to the Registry late last year.
>
> The Library of Congress does hold the original release versions of STAR WARS, THE EMPIRE STRIKES BACK and RETURN OF THE JEDI, but these 35mm prints were acquired as copyright deposits in March 1978, October 1980, and June 1983 respectively. All three are classified as archival masters and as such cannot be accessed for viewing/research. The existing condition reports for STAR WARS and THE EMPIRE STRIKES BACK (there is no report for RETURN OF THE JEDI) indicate that the former has minor scratches but is in good shape overall, while the latter has extreme color fading. We also have an additional 35mm print of the original STAR WARS (received June 1979) with English subtitles for the deaf.