This may be a stupid question, but do we know whether or not there are human remains onboard?
Valid question. A boarding party should have searched the vessel before sinking her. Not sure if that was done.
The vessel was waiting to be scraped when it was in Japan.
I did see a video clip of what looked like a USCG RHIB alongside for inspection.
No, there wasn’t anyone on the vessel when it was taken out to sea. It was in a yard, ready to be scrapped.