The FBI said Friday it had completed a DNA analysis of evidence that could help solve the 30-year-old mystery of the disappearance of Teamsters leader Jimmy Hoffa (search) and submitted a report to police.

But Bloomfield Township police and Oakland County prosecutors, who are investigating the case, said they were not even aware the analysis was finished.

"I've never seen it," Oakland County Prosecutor David Gorcyca told The Associated Press, adding that Bloomfield Township Police Chief Jeff Werner also had not seen a report.

The FBI (search) would not release details of the analysis.

An FBI spokeswoman said the report was issued a little more than six months after evidence was received by an FBI laboratory. She said the report would have been issued to the "submitting agency," which another FBI spokeswoman identified as the Bloomfield Township Police Department.

Hoffa last was seen on July 30, 1975, at a restaurant in Bloomfield Township.

Last May, authorities removed sections of floorboards from a Detroit house where Delaware Teamsters (search) official and one-time Hoffa ally Frank Sheeran (search) said he fatally shot the union leader.

Sheeran died in 2003 and his claim was detailed in a book published months later. Fox News Channel claimed its own investigation turned up blood on the floor of the house.

The floorboards were to be analyzed for the presence of human blood at the FBI's lab in Quantico, Va. If any blood were found, experts would compare it to Hoffa's DNA.

Gorcyca said the floorboards were given to the FBI to analyze because the agency has been involved in the investigation of Hoffa's disappearance from the beginning.

Gorcyca conceded he did not have high expectations the floorboards would test positive for Hoffa's DNA. But getting a definitive answer is important, he said.

"Every day that goes by, we have trepidations that individuals integral to this case could pass," Gorcyca said.