Either two things are going to happen:
1. The FBI isn’t going to hand over anything with the excuse that it’s classified.
2. The FBI shuffles it over quietly, and when something is found, the media will not report it.
3. The FBI will say it has nothing since it was a local crime and not their job..............
If a murder investigation concludes that Rich was murdered during an alleged “robbery” and at the same time claims the evidence is “classified”, you have a fairly compelling argument for a cover up.