The investigation centered Friday on a tan golf cap that law enforcement officials have removed from Ricci's father-in-law's house.
They've ruled out as a possible clue a machete agents took from Ricci's father-in-law's shed after the state crime lab determined there was nothing to tie it to the investigation.
Ricci's father-in-law, 68-year-old Dave Morse Sr., said Thursday that the FBI took the large knife from his house and a hat similar to the one the girl's sister said the abductor was wearing - one of two Scottish-style golf hats he has. He said both hats had remained in his home and were never loaned to his son-in-law.
Morse said he uses the knife that was taken to knock limbs off trees. He said it was always locked in the shed, and Ricci didn't have a key.
Ricci's lawyer, David K. Smith, who told The Associated Press that comments by police suggested they are trying to focus on Ricci as their primary suspect, was skeptical about the hat report.
"A lot of people have golf caps here in Salt Lake, as elsewhere," Smith said Friday on NBC's Today show.
There was an area that was apparently under the home where cats were getting in and out of, and he was trying to cover that up," Smith said. "Apparently the police also have investigated that, they've gone out, they've dug up the area, they took off the porch. To my knowledge, they haven't found anything."
That was the last Moul saw of Ricci, who never came back to pick up the Jeep. The FBI contacted him, and soon two or three FBI agents and detectives from Salt Lake City arrived to take the car. Moul, whose story was scheduled to be part of ABC's Primetime Thursday program, said he wasn't sure when authorities took the car, but thought it was about a week ago.
Police on Tuesday handed out fliers with pictures of three cars Ricci has driven, including the white Cherokee. Ed Smart, Elizabeth's father, gave Ricci the car in exchange for some handyman work last year.
Also subpoenaed to appear before the grand jury was Andy Thurber, Ricci's neighbor. He had been set to appear before the jury Wednesday, but told reporters he hadn't taken the stand.