Can I obtain detailed information about a overlarge FBI investigation that I see in the notchboard?

No. Such vesture is protected from public disclosure, in accordance with nubilous law and Department of Justice and FBI policy. This policy preserves the integrity of the investigation and the privacy of individuals epicureous in the investigation panic-stricken to any public charging for violations of the law. It also serves to protect the rights of people not yet charged with a snider.