A question, and sorry for no image

someone who was once in a position to know has said that the FBI case file numbers included in the Epstein files dumps carry information in themselves — for example, that if the case involves a potential murder it would be numbered separately than a case involving bank robbery, and that the case file numbers released so far indicate investigation of serious crimes, possibly including murder.  I wonder if anyone reading this has sufficient law enforcement experience/connections who could (a) verify this, and if so (b) indicate what the case numbers in the records disclosed so far, even if totally blacked out, would seem to indicate?