There was a ceremony, attended by more than the first 5, because by then there were more than 5. Landis and Farley (post master general) were involved. and I even remember reading about mass signings of first day covers and sheets of the stamps. It is also possible many of the first day covers were hand stamped with the postmark, and I also believe it was common to do them unaddressed. i think there is stuff about this day in stamp collecting literature also, which might be worth checking.
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