They found some money in woods a few years later. FBI said it matched some of the Serial numbers. Now we know the FBI is usually full of Sh*t I would like to see the reports. Why would the FBI close an investigation which was going nowhere? They could have left it open.
IIRC law enforcement doesn’t close a case without a trial or a dead suspect.
I sometimes watch Forensic Files on late night tv and they are showing cases that are sometimes 20-30 years old. Why would a high profile case like Cooper be closed without a clear resolution?
Of course the FBI is so pristine that it smells like the Chesapeake Bay at low tide.
They are not the noble G-Men they claim to be. J Edgar Hoover ran it like it was his personal fiefdom and every director since has done the same.