They should see if there are gift cards or credit cards. Law enforcement has been increasing scrutiny if gift cards. Apparently they are being used to launder money from drugs and other illegal activities. They should also look at the legal status of his businesses in other countries. He has companies set up outside the US to deal with at least some foreign money. The laws in those countries may.provide more access to information about corporations than the US. The tight also use.those filings to identify links to foreign governments acting as developers.