What report? I went to this restaurant and it wasn't busy? That is not a report, that is just conjecture. If a DA went to a judge with that as the evidence for a warrant, they'd be insulted and embarrassed by the judge.

It’s just conjecture but if there’s already an ongoing investigation it could help.

You can report stuff to the FBI and they will ignore most of it.

The FBI really doesn't want your garbage reports about random restaurants unless there's actual evidence of a federal crime. They're overworked as it is.

Good luck trying to convict people of serious crime based on a handful of people testifying they visited a restaurant and it was empty!