Got a letter today from Tokyo District Court Civil 20th Division.

Written in Japanese with a footnote stating the English translation is on the following pages - but there are no following pages...

Any ideas?

The airmail is actually both in Japanese and English. Did you check how thick the paper is? It is because you can "open" the thick paper and inside that you find the English translation.

However, it seems like there is no more info in that airmail than what was on the mtgox.com website already.