The U.S. Postal Service has moved more than $30 million in spending to FCB/Leber Katz Partners and FCB Direct, both New York. The billings represent the Express Mail, Priority Mail and collection-stamp accounts. The move is a significant gain for FCB, which previously only handled direct marketing for the stamps account. Young & Rubicam gives those accounts up, but keeps most of the postal service's remaining $60 million in business.