i'll cut to the chase ...

NO ONE CARE !

just dump those mail away.

and really, go just make a police report. you need to help those law firm and what ever firm as well. they have no choice since its the last known address. pass them a copy so they can go back to office and report that they have done their best ... they have nothing against you, its just their job.

on your end you need to send a notice to all those firm that the ownership has change and he/she no longer reside there and ask them to update their record. by registered mail and keep a record.

See, throwing it away is the easiest right ?