Roseville, Michigan (CNN) -- Police found no "discernible remains" in their search Friday for long-missing labor strongman Jimmy Hoffa, police Chief James Berlin said. Two soil samples taken from beneath a storage shed outside a suburban Detroit home will nevertheless go to a lab at Michigan State University for testing. Officials are expected to announce by Monday night if they've found evidence bearing out a tipster's claim that he saw what appeared to be a body being buried at the site the day after the former Teamsters chief disappeared in 1975. Even if they do, Berlin said he doubts any remains would be those of Hoffa.
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NEW: Drilling doesn't turn up bones, body parts or other evidence, police chief says
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A tipster told police that a body was buried at a home about the time of Hoffa's disappearance
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Crews took soil samples and will test them for human remains; results are expected Monday
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Former Teamsters leader Hoffa disappeared in 1975
Hoffa, then 62, was last seen on July 30, 1975, at suburban @placeholder restaurant.