If you lose a ton of money to a con man and you believe that by spending more (lawyers, investigators, time, etc.) you have a fair chance of getting more than the additional amount back from the con man, then you do it.
However, if you believe the chance of getting anything back is almost zero then you do not spend the additional resources.
It is as simple as that.
Can anyone see a clear path to get anything back from him?
Take as an example the supposed safety deposit box. Assume you somehow do get the authorities to act and confiscate it. We do not get it back. It is confiscated and then maybe, someday, way out in the future, you might see a small portion of it returned to you - a very big maybe.
I personally and we (the PPT operators) collectively have lost a fortune to this guy, would like to get it back, but so far we see no way to get any of it back.