Paul,
That brings up an interesting related point. Even back when I had the big office, we spent the week after Xmas cleaning out the files, just because it seemed crazy to pay rent for space to store a bunch of stuff. We only had so much shelf space. We tended to keep final drawings and discard all the preliminary sketches, routings, etc.
I always had a pang of guilt about that, but then I figured the number of people who would really be interested in the, say, third routing out of 20 in reaching the final plan would be about 3 out of 6 Billion, not very good odds. But, I figured some historian would think I ought to pay the money to microfilm them, etc.
Like you, my old files always bring back memories early, but get boring later. Sometimes, I save something one year, and then the next year, wonder why I bothered.