@Wayne *********
According to how the immigration office enforces the rules, it's the property processors' responsibility to confirm the TM30 is filed or get fined. The person who's possession of the property is you.
The juristic office can go to MTT and file the TM30 for you in person. I also never heard of any problems of submitting a TM30 if you're on overstay (which you aren't, but if you were, there should be no problems)