Md. Code, Transportation § 13–938

If registration plates issued for a vehicle registered under this part have never been used, the owner of the vehicle for which the plates were issued is entitled to a refund of the Maryland registration fee paid less an administrative fee established by the Administration if, during the registration year for which the registration plates were issued, the owner:

(1) Applies to the Administration for a refund; and

(2) Surrenders to the Administration:

(i) The registration card issued for the vehicle; and

(ii) The unused registration plates.