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I never understood this trick. Surely you could just mail an empty envelope ahead of time for the postmark, then put whatever you wanted to prove in it later?



I think the idea is that you keep it sealed until it is needed, then open it in some way that creates a legally admissible proof of the contents (maybe opened by a notary or something; and examined for postmark/envelope tampering by some sort of expert in that field, who can testify his training leads him to believe it is authentic.)




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