While I know FBI is involved in this case, let's take a realistic look at this. The FBI came to assist because there was a possibility that Caylee had been kidnapped across state lines, I am pretty sure that was the reason FBI came in. ALL physical searches were done by OCSO, FBI facilitated the examination of evidence by sending it to their lab. They also helped recover the remains and any evidence from the 'dump site'. They assisted the ME's office by giving the samples sent to them for analysis high priorty. Both GA and CA had an 'informational meeting' that they requested with the FBI. We all saw those interviews. CA and GA both filled out a questionaire about KC and from what I gathered from the interview tape was that CA was being completely unrealistic in her answers about KC. Not surprising. These were done in early August, I think. I remember CA going through all the people she thought might be involved, and I remember GA talking about the smell in the car, and while I don't remember specifics I am sure they may have lied about things, or at the very least shaded the truth. Did they, in that interview, obstruct justice? Because I think that interview was the only time the FBI interviewed them. they may have sat in when OCSO interviewed people, but I am pretty sure this interview, which was requested by the Athnoys, was the only one the FBI did as 'first chair' so to speak. FBI have people lie to them all the time - they don't prosecute every single person for every single lie. In fact, their arrests are for much serious charges in the cases they handle.
Basically, what I am saying is I seriously doubt the FBI is going to charge GA, Ca or LA with anything at any time. To be blunt about it, this is petty stuff and they much more important cases to work on. KC is in jail, I think it just doesn't matter to the FBI at this point, what the Anthnoys said to them. I assume the FBI has moved on to their next case. They may consult with OCSO over evidence testing, etc. but I think their overt involvment in this case has come to an end. IMHO, of course.