"[T]he increased interest in retirees over the age of 70-1/2 began in the Philadelphia regional office because Social Security advised new recipients of entitlement to possible benefits from long-forgotten retirement plans.... More than half a billion dollars of unpaid retirement benefits were discovered in only six defined benefit plans.... Recent efforts by the EBSA have resulted in the opening of investigations against trustees, plan administrators and Third Party Administrators.... The initiative which began on the east coast with the Philadelphia office has now migrated to west coast offices."