Forgotten Yahoo Password! Help please?

my boyfriend has had his password for his yahoo account changed by one of his friends who he no longer talks to. He made his account so long ago he cannot remember the security answers he gave. He also said that he made his account wen he lived in Philippines, so he didn't have to give a postal code. He doesn't have an alternative email address. He used my email so that yahoo could contact him, but that hasn't seemed to help. Is there any alternative ways to contact Yahoo?? He really needs to access his account. Thanks so much for anyone who can help!!