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It's your duty to develop those photos anon. It might be a good idea to make your intentions obviously public beforehand, to lend credence to the fact that you did not take the photos yourself. Really you could even contact your local police and say "I own some second hand film and I have no idea what's on it, I'm going to get it developed but thought I should tell you now that it could be anything. Anything". Make sure you move your eyebrows like gif related when you say the last part.