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A
No — mail is only available during business hours
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B
Yes — P.O. Boxes are accessible during the lobby hours of the post office, which are typically longer than the counter service hours
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C
P.O. Box mail is only delivered on weekdays
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D
P.O. Boxes can only be accessed with a key during counter hours
Why this is the answer
P.O. Box access is one of the key benefits of P.O. Box rental. Post office lobbies (where P.O. Boxes are located) are typically accessible earlier in the morning and later in the evening than counter service hours — and often on Sundays when counters are closed. Some facilities have 24-hour lobby access. This distinction between lobby hours and counter hours is a common customer question at 477 counter positions.
Source: USPS 477 VEA, P.O. Box Services