The FBI is investigating the possibility that union boss Jimmy Hoffa’s body is buried in a former landfill in Jersey City under the Pulaski Skyway, a report said. The search was sparked after a tip passed down from a worker who said he buried Hoffa in a steel drum just outside of the former PJP Landfill, now Skyway Park, the New York Times said. An FBI spokesperson confirmed to The Post that agents had conducted a “site survey” under the Skyway last month after obtaining a search warrant, but wouldn’t say if the search had anything to do with Hoffa,...