Check the value but most baseball cards don’t have nearly the value the once did (and probably never will). Unless rare and worth a lot already, I’d probably open and tear through them to feel young again for a few minutes. Then again, it’s a complete set so you already know what you have.
I still have some, mostly from the 1970s and early 1980s, in plastic sheets in binders in our guest room closet. Few good ones too, like Eddie Murray, Ozzie Smith and Roger Clemens RC. I also have a 1975 Carlton Fisk card that I wrote “Very good player” on when I was 7 years old.
Last time I looked at values, it wasn’t worth dealing with selling them. So in the closet they sit. I sold thousands of them when I was 16 and wanted a car.