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by IggleSniggle 974 days ago
Internet access is not necessary for Find My to work. Your devices all broadcast their public key over Bluetooth and NFC, and your devices all also have your own private key, and so are identifiable / visible in Find My.

Even if they hadn't had the local map, they can still get some useful signals from Find My (and they can still push Ring requests). However, in their case, their old phone still had the log of the last seen location. Again, no Internet required.