I would not call it a blacklist, but, you become a 'person of interest' and you and/or your address and shippers are flagged for future scrutiny. Think about it for a sec, why would they NOT keep a list of people who've tried to ship or have shipped proscribed items in the mail? If I was in charge of the system and responsible for interception, you can be sure I'd do it. It would make my job easier.
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