HOW TO IDENTIFY SUSPICIOUS PACKAGES AND LETTERS

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From the USPS:

Some characteristics of suspicious packages and letters include the following:
· Excessive postage
· Handwritten or poorly typed addresses
· Incorrect titles
· Title, but no name
· Misspellings of common words
· Oily stains, discoloration or odor
· No return address
· Excessive weight
· Lopsided or uneven envelope
· Protruding wires or aluminum foil
· Excessive security material such as masking tape, string, etc.
· Visual distractions
· Ticking sound
· Marked with restrictive endorsements, such as "Personal" or "Confidential"
· Shows a city or state in the postmark that does not match the return address

I've just got one thing to say. Ticking sound?