After the story broke, besides police searches, there were numerous self-proclaimed bounty hunters and other treasure seekers scouring the forests and river areas in S. Washington state where D.B. allegedly jumped.
These hunts went on for years after it happened.
Only thing they ever found were Sasquatch footprints :-)
They must be quite common in that era, and of little value?
Perhaps the Sasquatch kidnapped D.B. Cooper, he justed wanted a friend.