You can exchange stamps at a Post Office only under specific conditions:
: Flawed stamps or incorrect denominations received from a Postal Store order. 2. Can I Exchange Old Stamps? usps buy back old stamps
: These are always valid for the current First-Class Mail 1-ounce rate, regardless of when they were purchased or how much the price has increased. You can exchange stamps at a Post Office
: Stamps that are damaged, stuck together, or otherwise "spoiled" through no fault of your own can be exchanged for an equal number of stamps of the same denomination. usps buy back old stamps