Wolfman said:

I'm reading the book 'The Making Of Day Of The Dead', and in it they mention the filming location of The Wampum Caves, later known as the Wampum Industrial Facility. Well, the facility is just like the film. A huge 2 million square feet underground storage area where everything and anything is stored. In the film it is mentioned that stored down there are "the negatives of all your favorite movies". Well, the book mentions that the negatives of the Star Wars films were stored down there. With so much stuff stored down there I wonder if the originals are still there !

I've read that book and wondered those thoughts myself.
But I remember reading somewhere that there was some kind of accident (Flood? Fire? I can't remember) sometime in the 1990's that destroyed most of what was stored down there. I did a quick Google and didn't find anything, so maybe I'm wrong.