They are looking for “trace evidence, blood, DNA” as well as possible “trophies,” Suffolk County District Attorney
Ray Tierney said last week.
“Normally, people keep mementos of significant times in their life, so that’s what we’re looking for,” the DA told Newsday on Thursday.
The heavy machinery brought in over the weekend marked a major intensification of the search that started 12 days ago when the architect was busted outside his Midtown Manhattan office.

Officials have yet to reveal if the ongoing dig and intense
search of Heuermann’s home — as well as his office, vehicles and other properties,
in South Carolina and Las Vegas — has unearthed new alleged evidence likely to be key in the case.
Suffolk County Police Commissioner Rodney Harrison refused to discuss it with NBC News in an interview that aired Monday, only noting the “disturbing” discovery of more than 200 guns.
However, he revealed how dismissive Heuermann, 59, had been when he was busted murdering three of the “Gilgo Four,” and named the prime suspect in the fourth.

“He very much said, ‘What am I here for? I don’t know nothing of what you’re talking about,'” the top cop said.
Investigators continued using heavy machinery to dig up the yard of suspected serial killer Rex Heuermann on Monday — as police revealed his blasé first words when he realized he was finally being …
nypost.com