Yours might be okay despite storage conditions. I'd load a hundred of them in a familiar load. if they all fired, I'd use the rest without question. However, if I had just one that didn't fire with the first trigger pull, I'd junk them all.

I know primers are hard to find, but unreliable ones are worse than none at all. Primers that have been made since I began handloading decades ago are incredibly reliable; brand doesn't matter, and I've probably tried them all at some point. I used 1970s primers this year that were properly stored and they worked with 100% reliability. Shelf life of primers is roughly forever except under very adverse storage conditions.

I misread your post... if you only have a hundred, load them up. I bet they'll fire. If some don't, break them down.