That is horrifying those films were junked. That means we are talking the late 70s when people were already aware of how important those original elements were. I was seeing beautiful prints in NY revival houses and the directors of those houses knew patrons wanted to see great prints. That's why you went to a theater to see them. Otherwise you could just see them on TV. The print of SITR(it practically burned your eye the colors were so rich) at the '75 revival in the Music Hall had Vincent Canby so thunderstruck he did a long NY Times Sunday piece on it that weekend. There was also a hit 70s extended run revival of The Gang's All Here at I believe maybe the 57th Street Playhouse. Rex Reed said the colors were so amazing the print must have been kept all those years in Daryl Zanuck's sock drawer. (Yes he meant it as a compliment.) The people who did this were really oblivious incompetents. I mean even Disney and MGM knew what they were doing.