Each financial institution other
than a casino shall file a report of each deposit, withdrawal, exchange
of currency or other payment or transfer, by, through, or to such
financial institution which involves a transaction in currency of
more than $10,000, except as otherwise provided in this section. In
the case of the U.S. Postal Service, the obligation contained in the
preceding sentence shall not apply to payments or transfers made solely
in connection with the purchase of postage or philatelic products.