more than half of them have big chunks of black plastic rattling around inside the cassette. I'm afraid to play them. Is this a defect for which they should be returned? What would you do? Should I try to play them and see what happens?
Now, what would I do???? - I would return them or at least call customer service and tell them what is going on. Have you opened them yet? My view is that if they do not malfunction in the 90 days you have to return them if defective...eventually, they could. Just my opinion.