The 2006 is quite a strange facsimile, as its not at all the theatrical cut. Its just the Definitive collection with worse more compressed audio of the 1993 mix, with the 1977 crawl tacked onto the beginning.

Still its pre–Special Edition if not quite the real deal.

Earlier releases did have the theatrical 35mm mix the Dolby Stereo, so they must just have been incredibly lazy. Seeing how fans could retrieve the audio off of laserdiscs. Or even VHS.

I’m getting up there in age and even I haven’t seen the pre 1981 cut on 35mm in the cinema. It hasn’t been shown in over 40 years. Nobody has seen it since 1980. Beyond an odd screening here or there, but not more wide and broad, no restored print exists.