That's right, the FBI has general investigative powers. But in a complicated securities case, they usually act for the SEC, do their interviews, etc.
It's very easy for the SEC to put an end to PT's games with a 15 day trading halt. At that point, PT would need various documents to relist his companies.
Don't think this is the end of NTCV. If it was, he'd have let me try to fix it into something. Believe me, he intends to recycle this again and again.
As for CCDX, we already see the games beginning.