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.
I am driving to the San Diego FBI field office tomorrow. I live about an hour north. If anyone else is interested in joining me, drop me a PM.
I contacted a crypto-tracing company called Cipher Blade and spoke with them about tracking our stolen bitcoin. They said they could, but are generally hired by a law firms and used as subject matter expert witnesses in court cases. They advised me to go to an FBI field office directly and forego the IC3 website, but only if it was convenient. And in my case, it definitely is. Otherwise, just file online.