By using stolen USPS master keys — also called “arrow” or “universal” keys — crooks are able to unlock multiple mailboxes at once. “Yeah, not great.

Arrow keys are a universal key that fits a variety of mailboxes. USPS is working on replacing those keys with a new digital key. Johnsten said the new keys are making the biggest difference.

Postal Service replacing universal mail keys 00:29. WASHINGTON - The U.S. Postal Service has announced a new measure to keep mail carriers safe. The number of letter carrier robberies is on the ...