I still have all studies in the scriptures (different versions) and Rutherfords rainbow collection along with yearbooks and bound volumes of Watchtower and Awake, Consolation and Golden Age and Reprint of Zions Watchtower.
I just keep them in boxes and occasionally I reference them when I am not able to find what I need online.
i got rid of many from the 80s.
Since I was an elder I have various copies of the elders book (Pay Attention to Yourself ... and the 3 volumes prior) as well the Pioneer Book (Shinning as Illuminators 2 versions) and much more.