New affidavits obtained by News 8 reveal even more details about the early morning hours when 21-year-old Zuzu Verk disappeared more than two weeks ago.

The documents, filed as part of search warrants in district court, show that investigators wanted to search suspect Robert Fabian's Jeep for "blood evidence." It doesn't state whether any such evidence was found.

Fabian is Verk's boyfriend. Authorities say he has been uncooperative in their investigation into the Sul Ross State University student's disappearance.

"He really could answer questions for us," Alpine police Chief Russell Scown said again on Thursday.

The probable cause affidavit also reveals that a Google timeline linked to Verk's Android phone shows the phone was last " a close proximity..." to Fabian's apartment on N. Harrison Street near the university.

As News 8 first reported on Wednesday, other search warrant affidavits indicate Fabian borrowed a pick-up truck belonging to his sister and brother-in-law during the early morning hours of Oct. 12.

Around the same time on the same morning, another warrant states that Fabian exchanged two phone calls and a Snapchat with his friend, Chris Estrada, another person of interest in the case.

Estrada has been cooperative in the investigation, police say, but results of a polygraph test he took earlier in the week were inconclusive.

On Thursday, News 8 attempted to track down Fabian.

He wasn't at his apartment. At his sister's house, a woman who answered the door wouldn't say where he was. Fabian's family are also now persons of interest, according to Chief Scown.

He said investigators with the attorney general's office arrived late Thursday to get updated on the investigation.

"We may get a grand jury convened, and then we could get some of these key people to answer questions," he said.

Liz Rogers, Fabian's attorney, has repeatedly declined to comment.

The affidavit obtained Thursday also suggests Fabian initially lied to investigators by telling them that Zuzu left his apartment in her car early the Wednesday she disappeared. Witness statements say her car remained at the apartment until later in the morning, according to the document.

It also reiterates what other public documents already suggest: that Fabian reported his girlfriend missing only when "...Zuzu's mother told him to call the police department."

Search efforts continued on Thursday, with teams again using drones while focusing their efforts close to town.

The Brewster County Sheriff's Office is reminding hunters in the area that on the opening weekend of quail season, they should be on the lookout for anything unusual.

There remains a $100,000 reward for credible information leading to Zuzu's whereabouts.

Earlier this week, the Verk family told News 8 they would be in Alpine for "as long as it takes" to bring their daughter home.