USPS Registered mail is EXTREMELY secure. You can send classified documents via
If the item is valuable, like cash or jewelry, you can insure it as well.
Other carriers will not accept cash, but USPS is OK.
When you order anything over a certain value (like a bag of 2000 dollar coins or
eagle/"buffalo" gold coins) from the US mint online (or by phone or mail order),
them to you registered and insured.
The complete USPS mail manual is online.
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