A break in the case? From the Detroit News:

The FBI is mounting one of its biggest searches to date for the remains of former Teamsters boss James R. Hoffa, bringing in dozens of agents for what agents say will be a multi-week dig at an 85-acre property once owned by one of Hoffa’s closest union associates.
Thirty years of myth and legend have placed Hoffa’s remains everywhere from the Giants’ stadium to a Japanese auto factory to swamps of the Florida Everglades to the bottom of Lake Michigan.
But acting on what some investigators say is the best tip in years, authorities now believe the remains of the missing Teamsters boss may yet turn up in the pastoral Hidden Dreams Farm less than 20 miles from the suburban parking lot where he last was seen July 30, 1975.