This is interesting. I'm going to say this again. While I don't trust the FBI. They're a really scummy organization. When it comes to investigations from anyone radio silence doesn't mean nothing is getting done. You don't want to go blaring out you're conducting an investigation otherwise the suspect(s) will take certain measures like destroying evidence. Often they keep quiet till they can catch the suspect in the act, or get warrants for raids to collect evidence. Then they'll go quiet again before pressing charges. The big problem is such processes take years. I worked for a company that got investigated by the FBI. We're probably investigating us years before they raided us and then didn't bring any charges until years after that raid.