I need some ideas about the best way to preserve old family letters. I have several boxes now and I went ahead and put them in plastic boxes to keep mice out, but I am seeing archival paper acid free boxes--is that better. They are currently stored as they have been stored, folded and in envelopes. But some people put them in plastic sleeves in binders so they can read both sides of the letter, since most are only two sides of the page.
Any ideas of the best way to proceed? I'd like to be able to read them, but now I feel guilty folding them up and putting them away in the envelope, but they have survived all this time that way, and many are almost a hundred years old.