Back in the day, I would keep a copy of each magazine throughout the year then throw them out when the bound volume would come out. I had the bound volumes from 1972-1984 (the years I was married to a JW). When I was no longer attending and moved into my new home, I asked my parents if they knew anyone who would want them. My elder dad knew of several families in his congregation who were poor and would appreciate having them, so he took them. I didn't have to worry about throwing them out.
I have kept only a few of the books, an outdated songbook, "Aid to Bible Understanding", "Jehovah's Witnesses in the Divine Purpose", "All Scripture is Inspired of God and Beneficial", and my old green Bible. Geez, why did that chose that awful color for a Bible??? I kept those books thinking if I ever needed a good Bible reference I would have it. Knowing what I do now, I wouldn't rely on those books for any accuracy at all.
And P.S. Back when I was a Witness, there was only ONE version of the Watchtower, at least have to give that to them. From what I read on this site, the "Truth" as I knew it has greatly changed!