A debtor outside the U.S. is notified of the overpayment in dollars and asked to make
            refund in U.S. currency where alien taxation is involved and the debtor is in current
            pay status). The debtor may, however, submit a check, money order, or cash in the
            applicable foreign currency to SSA, or its agent (i.e., the Federal Benefits Unit
            (FBU), due to national currency restrictions precluding the mailing of dollar instruments
            out of these countries. A refund made in foreign currency is converted into U.S. dollars
            and the debt account credited with the actual dollar value. If the foreign currency
            refund is received by the FBU, the applicable exchange rate will be that in effect
            at the time the agent actually receives the foreign currency, check, or money order.
            If the foreign currency refund is received in DIO, the applicable exchange rate will
            be that in effect at the time of the actual monetary conversion.