Legacy code

I have code and printout dating back into the 1970s. Most (all?) of the oldest electronic files will no longer run but I have hard copy of many programs. I have been unable to locate a couple of thick file folders of publications on case-based reasoning which also contained the first CBR programs I wrote. I suspect that these may have been discarded by mistake a few years back when there was a remodeling that tore the outer wall off the science hall (and my office). I've written too many hundreds of programs to want to spend the time needed to preserve them all.