The FBI has been searching a pile of broken concrete slabs on the farm with a frontloader.
Patrick disappeared on Wednesday, the other three on Friday.
NBC reports Patrick went missing July 5, Finocchiaro was last seen getting into a vehicle on July 7, Sturgis was last seen on July 7 before leaving his home to visit Meo. The other missing individuals are Mark Sturgis, 22, of Pennsburg, and Tom Meo, 21, of Plumstead.
Authorities are looking to find out if there is a link between the separate disappearances and for a reason.
"How can the public help?" Authorities searched the farm after a signal from Finocchiaro's cellphone led them there, the Times reported. Dinardo has been arrested on charges that do not relate or pertain to this case.
"We're going through it with the equivalent of a fine-tooth comb", the district attorney said, noting 40 cadets from the Montgomery County Police Academy were brought to the site today to scour the cornfield for evidence. That charge was initially dismissed in May. Attempts to reach DiNardo or his family were unsuccessful Monday. On Tuesday, Mr. DiNardo's lawyer, Michael Parlow, was not immediately available to answer a telephone message.
As the investigation continues into the disappearance of four Pennsylvania men, Action News has learned a auto belonging to one of those men has been found.
"Take the biggest (investigation) you've ever seen and multiply it by a million", Weintraub added later.
"We're still trying to run that down and ascertain if that is accurate or not", he said.
"It's hard. We're all just shaken up by the whole thing. But that's what it's going to take, apparently".
Weintraub provided few updates on the investigation during another press conference Monday afternoon, revealing only that he believes foul play was involved and that police are focusing their efforts on the multi-acre property near Aquetong Road. The post also said Meo is diabetic. A reporter asked Weintraub whether he thought the four men were still alive, to which he replied that he hopes and prays they are, as that would obviously be the best outcome. A neighbor who lives near the DiNardo's large farm property off Route 202 called the son "pretty nutty" on Monday.
DiNardo recently was involved in a bad dirt bike wreck that left him with a head injury that the friend said appeared to alter his behavior. The station, citing family members, said that his absence without calling was extremely unusual.
On Facebook, Mr. DiNardo is friends with Mr. Patrick, who disappeared last Wednesday. Finocchiaro has been arrested multiple times on charges that include drug possession, driving under the influence and assault.
DiNardo is a 2015 graduate of Holy Ghost Preparatory School, a private Catholic school in nearby Bensalem, a friend told HuffPost.style="text-align: center;"