Have you opened in the the last three years? If not, toss it. I wouldn't bother trying to sell them. Books aren't worth much. Recycle sounds like the best opti

Have you opened in the the last three years? If not, toss it. I wouldn't bother trying to sell them. Books aren't worth much. Recycle sounds like the best option. But I would put them up on Gumtree/Craigslist/Local FB group to see if there is a CS-Student or similar who couldnt' make use out of some of them. That said, I have a couple of boxes of tech books in the shed that I've still not gotten rid of.