What everyone is saying about using records to confirm is true. Additionally, in some long term unidentified cases, local police will get the coroner to X ray the decedent’s teeth, and then send that info to a bunch local dentists to see if *they* can recognize the teeth and subsequently match them using actual records. I believe this is what happened in the Somerton Man case (he’s still unidentified, though they’re now trying DNA databases out).
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