Did someone contact the FBI? They have a whole division dedicated to Crypto crime. Id say also, that most BTC theft originates from oversees so the FBI's hands are tied and its difficult to get resolution. But in this case since most of the victims and the suspect are on US soil it may get bumped up to priority. Plus they are not hampered by state lines and have extra resources to track him down. I do think someone should organize a list of US victims, total losses for each person, contact info, a written synopsis of everything that happened, and  most recent suspect info. Id start calling them immediately or go down to local field office before statute of limitations expires.