A good way to find out is to look it up on eBay. Someone’s probably selling one right now. See what that’s going for, and jot down any details they mention on the listing. If their listing mentions a year, edition, or other clarifying detail, check to make sure yours matches theirs, and if not, just keep record of which version yours is.

Then go to the Google. Ask it how much you can get for “your version”. If there’s a market for it, it should point you on the right direction.

I don’t know but I don’t think that box set was available past the 80’s and its an easy thing to become in poor shape even if someone did keep it around so I would not be surprised if it was worth something.

I wouldn’t think any of those are particularly valuable, but nice to have sure.

I have a couple of the same first edition d&d books: My dad’s from when he ran a campaign for us when I was seven years old. So glad I have 'em still. I run a biweekly campaign with my dad, aunt, uncle, and cousin’s husband. (And also play in one run by said cousin’s husband, same group.)

When checking eBay always check completed auctions. I recently acquired some 1st and 2nd edition d&d books for my shop. I was going to put them out on the shelves. There was a copy of one of the books listed at $250+/- but I switched to completed listings and for the last 6 months they averaged about $46.

Worth more than most copies you find online because the box looks in nice condition, but not especially valuable. They printed a ton of copies of that edition, it was very popular in the 80s.

Maybe consider playing it? I really like the way the Basic Set plays. Very different from the modern game.

Give them to a nerd that will appreciate & keep them.

That same edition, too?

I’d consider buying these just to have them in my collection, but it would just be a fun read and collector’s-item/museum-piece-kind-of-thing. Not sure I’d ever play them or read them more than once.

A lot of people would buy these simply to have in their collections.

It’s absolutely worth them big time! That is some old-school stuff that you could certainly keep, especially since newer versions after 5e are probably going to be trashed by WotC, knowing the mistake they made by putting 5.1 under CC BY.