The entire case is a matter for the LAPD, not the FBI. The FBI would only have jurisdiction if the victim is kidnapped and/or murdered and transported across state lines. Sinclair would be, at most, just a witness.
A large quantity of special glass for the Aquarium trick was said to come from a plant in Garmisch, Germany. Garmisch is a small skiing, tourism and farming town in the Bavarian Alps. It has no manufacturing base.