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I've been researching this for the past hour and so far all I can come up with is that mail that is being sent to certain government offices is being irradiated. This was implemented during the 2001 anthrax attacks. The only issue I have with this answer is that most articles and materials only date back to 2002. I have not been able to find any information that is more recent.

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13y ago

What else can I help you with?