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.
THE ABOVE.
Additionally, what I think makes this case different that just 'cyber crime' is that we have actual physical products with an ascribed cyber value. His actual signature is on the certificates of authenticity, as well...
The evidence is overwhelming. I would imagine its a slam dunk. A lot of times the theft to the btc wallet is hard to tie to the theif. In this case money was held by his company and held hostage by his website. The FBI wants to close cases. They are reluctant to spend resources on a case that may never get solved. But in this case once evidence is presented they will see it can be solved. Im confident they will look into it.