Isn't the Polish address just a registered office and not an actual business office?
I think all support is handled out of Japan. It's unlikely that the funds which are in their Polish bank account are going to be treated differently to the funds in their Japanese bank account. They seem to have counted all of their bank accounts in their assets so your deposit is probably now tied up in the insolvency process.
You might find this thread helpful.
https://bitcointalk.org/index.php?topic=488883.0