There are likely about 400,000 cases of benefits not being paid to postal life insurance customers before postal privatization began in October 2007, Internal Affairs and Communications Minister Kunio Hatoyama said Friday.

The total is estimated at "between 300,000 and 400,000," Hatoyama told reporters after Japan Post Insurance Co. presented a report on the matter to the ministry.

Japan Post Insurance is examining some 13.01 million cases in which payouts should have been made by Japan Post, the state-run postal company that existed before privatization split it into four entities. Japan Post operated between April 2003 and September 2007.