Within 5 days after the National Labor Relations Board or other public or private unit certifies or recognizes a bargaining representative, the bargaining representative shall submit to the Mediation Service a report that contains: notice of the certification or recognition; the name and address of the employer; the total number of employees in the business establishment; the total number of employees in the bargaining unit; and if known, the date on which negotiations to establish a collective bargaining agreement are to begin.