The warning especially applies to anyone who may have mailed money over the past weekend.
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Authorities say outside mailboxes were broken into at the Oradell Post Office Sunday night.
They say many pieces of mail were opened and a lot of checks were stolen.
Only some mail was recovered, including a number of holiday cards, and officials say they have no way of determining if a particular piece of mail was taken or not.
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The US Postal Inspection Service is investigating the incident.
Customers are advised to:
--Contact your credit card company and bank if you dropped checks in any of the mailboxes
--Monitor your accounts
--At home, don't let mail accumulate
--If you use P.O. boxes, use them during the week and during they daytime hours
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