Why do people collect cars when they don’t drive them ever? What about stamps (who use stamps anymore)? Pokemon cards? We keep things that bring us memories and make us happy from time to time. If they have ever made you feel proud or happy, I would say keep them. It definitely worths more than the monetary gain from selling them.
Put it in a bank earning 4% interests and live off of it for the rest of my life. Yeah I’m a simple man.