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Pre-suppose the background and context in the TV series Man in High Castle. If you remember the details I forgot, just edit this please.
I can't remember why and what episode, but the Crown Princess Michiko hands a letter of safe passage to Robert Childan (Brennan Brown). If I remember, it contains her seal.
I can't remember at what second. In Season 4 Episode 9, Childan and his new wife Yukiko are trying to board a ship to Japan. But a very disrespectful, unmannered rude Japanese male soldier allows just Yukiko. Childan shows him the Crown Princess's letter, but the soldier alleges it's fake and refuses it. Then Childan and Yukiko try to bribe the soldier, but it fails. Ultimately, only Yukiko sails away on the ship, and Childan watches her leave.
What could the Crown Princess have done to that letter to foolproof it, so that nobody can distrust it? I'm not asking about other solutions, like giving Robert her phone number in case of emergencies.