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What does it mean when a new social security card is made and signed for by the postal station?

This phrase means that the new application for a social security card has been sent by postal courier to the designated receiving location of the postal bank.

This receiving location is either a postal bank branch or a station that specializes in this type of business. Usually, when a social security card is mailed from a production unit (such as a social security office), it is delivered via postal EMS. After a period of transportation and sorting process, the cards are delivered to the nearest postal service point. At this stage, the postal worker records the card in the system as "Signed for by Postal Service", indicating that the mail has been received and further delivery will be arranged.