Patrick had been last seen on Wednesday, the other three on Friday.
"We are not done yet".
"There was an attempt to burn the bodies, to deface them, to obliterate them, but I don't believe that was successful", Bucks County DA Matthew Weintraub said in a press conference Friday. The hole in which the remains were buried, according to DiNardo's confession, is 12 and a half feet deep and was discovered by police dogs.
The detention comes on the heels of Cosmo DiNardo's attorney saying that his client admitted to killing the four men and telling authorities the location of the bodies.
It is now feared they belong to Mark Sturgis, 22, and Tom Meo, 21, who also vanished on 7 July, and Jimi Tar Patrick, 19, who went missing two days earlier.
Investigators have been combing through all of Bucks County to search for clues in the men's disappearances but have focused on the vast stretch of property owned by DiNardo's family.
Police say one man went missing Wednesday and three others on Friday.
A friend of Meo said DiNardo sold guns and marijuana and had previously bragged about having someone killed over debt. Patrick was last seen at about 6 p.m. on Wednesday in Newtown Township, and did not show up at his job the next day, the New York Times reported, citing authorities.
PEOPLE could not reach any of the missing men's family members for comment.
"It was so far away (from the others on the farm) that I started to get sick to my stomach on the ride", he said. According to the arrest report, DiNardo suffers from mental illness and had been involuntarily committed to a mental institution at that time.
DiNardo is in jail being held on a $1 million bond in connection to the firearms possession allegation, not the men's disappearance. Both Meo and Sturgis' cars were reportedly found.
"We're going to bring each of these lost boys home to their families, one way or another", Weintraub said. It remained unclear how the four were connected.
The discovery of the remains - more than three days after the start of an exhaustive search at the DiNardo farm that involved local and state police, Federal Bureau of Investigation agents and U.S. Marshals and saw the men's families holding vigil in the July heat - was the biggest finding yet in a case that has gripped the region and drawn national attention.