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The only person who got identified was John because he was not part of the chain, so he wasn't forgotten. Everyone else was erased from memory so they remained unidentified.
(Although, how this would work in reality is quite unclear since physical evidence like photos or dental records does not get erased, so the police should be able to find a match after some research... They just won't find anyone remembering them, but they should have been able to put a name to the bodies.)