The 19-year-old from Newtown was last seen on Wednesday, July 5.
During a Monday afternoon news conference, Bucks County District Attorney Matthew Weintraub said investigators are running down leads in the disappearances and "are making great progress" as they search a large area of farmland about 30 miles outside Philadelphia.
The search of the missing men focused on Cosmo's parents, Antonio and Sandra DiNardo family properties, including a 90-acre farm in upper Bucks County where the remains of Dean Finocchiaro were found.
"We're going to see this investigation to the end", Weintraub said, "We're going to bring each and everyone of these's lost boys homes to their families, one way or another". That was followed by the disappearances of 22-year-old Mark Sturgis, of Pennsburg in Montgomery County, 21-year-old Tom Meo, of Plumstead Township, and Finocchiaro on Friday.
Patrick and DiNardo both attended Holy Ghost Preparatory School in Bensalem.
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Dinardo had been arrested earlier in the week for owning a gun he was not allowed to possess under state law because he had previous been involuntarily committed in a mental health facility, prosecutors said. Police are pursuing homicide charges against him. "Mr. Dinardo is a person of interest in this case, but sometimes the chasm between being a person of interest and being a person who is accused, arrested and convicted of a crime is so wide that we never cross it". The vehicle was recovered Sunday at a property owned by the Dinardos, the district attorney said.
Patrick, the first of the four to go missing, just finished his first year at Loyola University in Maryland, a Jesuit school.
The "grave", he added, was found by cadaver dogs, he said.
Weintraub said investigators found Meo's critical diabetes treatment kit in the vehicle.
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Authorities have not yet filed charges against anyone in connection with the death of Finocchiaro or any of the other men. A magisterial district judge ordered him held on $5 million cash bail, saying he found that DiNardo "is a grave risk".
Investigators say the title was not signed by Meo, indicating no legal transfer of ownership.
Sturgis and Meo were close friends, CNN affiliate KYW-TV reported. Finocchiaro disappeared July 7.
But DiNardo was prohibited from owning such a weapon, the document alleges, as he was "known to be suffering from a mental illness" following his involuntary commitment to a mental institution.
Beitz said he believed DiNardo was the last person to see his friend alive. The other three disappeared Friday.
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Weintraub stated: "We've been treating this from the outset as a criminal investigation and nothing has deterred that from this point".