A tipster recently came forward and a radar test revealed a shift in the soil, both of which prompted Friday's drilling. Berlin said the house may have been owned in the 1970s by a gambler with ties to organized crime.
Hoffa was an acquaintance of mobsters and adversary to federal officials. He spent time in prison for jury tampering. He was declared legally dead in 1982.
Previous tips led police to excavate soil in 2006 at a horse farm northwest of Detroit, rip up floorboards at a Detroit home in 2004 and search beneath a backyard pool a few hours north of the city in 2003. Other theories were that his remains were ground up and tossed into a Florida swamp, entombed beneath Giants Stadium in New Jersey or obliterated in a mob-owned fat-rendering plant.
Szpunar said she's just happy to have her shed back.
"My son can put the motorcycle back in there," she said.
Police had put a new, more secure lock on the shed. They gave Szpunar the key Tuesday.