Reader AM informed us that Japan Post no longer accepts alien registration cards as valid identification.

"Even though alien registration certificates are valid until 2015, Japan Post decided effective July 9, 2012, to no longer accept such cards. Please see this website," he writes.

"I found this out when needing to show identification for receiving a restricted delivery mail service document. I am a permanent resident. I find it odd, perhaps discriminatory, and certainly a bureaucratic overreach on the part of the postal service."