ribbon would be dried out but to my surprise I was still abl
I've noticed this too. It's a bit puzzling, because it seems like ribbons for my dot matrix printer would dry out and fade horribly. I remember one case when I bought a printer ribbon that had been presumably sitting on a shelf a long time. It was so dry that my old, worn ribbon actually had darker print!
I remember seeing a typewriter at a yard sale about ten years ago that had a piece of vintage typing in it. It was dated, and it was many, many, many years before. Unless someone was setting up a prop for the sale, it was, I guessed, something that had been started, but not finished before the person gave up on the typewriter. Person won a new electric in a sweepstakes, and decided to start from scratch?) Thus I assumed the typewriter had been out of service for years. Yet the ribbon still worked--lower down on the page in the machine, there was fresh typing people had added recently to test the machine. I think I added a few characters myself. While the ribbon wasn't great it still left a readable impression.