Contact your local University’s Film or Media studies department. They may be able to provide you information on what you have. You should also be aware that celluloid film can degrade, and they may be able to advise you on how to preserve it. If you don’t have a local university with a film school, try contacting the Moving Image Research Collections at the University of South Carolina- I’m not sure they’ll be able to help you, but I’d expect they’ll be able to direct you to someone who can.