Cool find! Just be careful, as I’ve heard that nitrate film can spontaneously combust. Back in the old days, one of the major studios lost a ton of silent films due to that. It seems like that’s only likely to combust if the film is decomposing, but I’d take precautions just the same. See this link for info: https://www.kodak.com/US/en/motion/support/technical_information/storage/storage_and_handing_of_processed_nitrate_film/default.htm#spont
Hope that helps! 😃