Well since you are not dealing with a great deal of money, nor historical importance, I would say that what you are doing is fine !! Unless you want to keep them for eternity !! If you do then go to an art supply store and get an acid free envelope to put them in !! I think there are some clear ones !! Like what you would use for photo`s !!
Forgot to say,, when I read the subject here and saw your name, I thought you might have found "Lone Ranger Comic books" !!