46 C.F.R. § 308.514 Return premium.
Title 46 - Shipping
No premium will be returned to the assured with respect to a shipment of goods that attached under the policy except where there was a declaration of value at variance with Clause 8, or an error in the application of a rate or in the computation of a premium, or the insured goods were short-shipped. An application for the return of a premium shall be made on Form MA–307, prescribed in §308.527, filed in duplicate with the Underwriting Agent who will transmit it to the Maritime Administrator for payment.
Title 46: Shipping
PART 308—WAR RISK INSURANCE
Subpart F—War Risk Cargo Insurance
II—Open Policy War Risk Cargo Insurance
§ 308.514 Return premium.