Advice for handling mail
What should make me suspect a piece of mail?
It's unexpected or from someone you don't know.
It's addressed to someone no longer at your address.
It's handwritten and has no return address or bears one that you can't confirm is legitimate.
It's lopsided or lumpy in appearance.
It's sealed with excessive amounts of tape.
It's marked with restrictive endorsements such as "Personal" or "Confidential."
It has excessive postage.
What should I do with a suspicious piece of mail?
Don't handle a letter or package that you suspect is contaminated.
Don't shake it, bump it, or sniff it.
Wash your hands thoroughly with soap and water.
Notify local law enforcement authorities.
Source: U.S. Postal Service