I must admit, I have kept every Canon camera/lens box since 1978. However, being in the Air Force for 30-years and moving more times than I want to remember, I've lost most of the pre-1980 stuff. I do have most of the EOS-1 film body boxes and now, all of my digital camera boxes. I have included the boxes and all material that came in them whenever I sold one of my bodies/lenses, which made the new owners very happy.
Now that I'm in my "Golden Years," I guess it's time to start thinning things out. There used to be photo swap meets here, which were great places to find/sell old gear. However, no one seems interested in doing that these days which is probably due to the Internet?
Oh well, maybe I can make someone's day down the road with some little treasure they've been looking for.