Google is working tirelessly to retrieve footage from various security cameras at Nancy Guthrie’s home — but the chances of recovering more critical video are slim, the sheriff leading the investigation said.

The 84-year-old mother of “Today” show co-host Savannah Guthrie had multiple cameras at her house near Tucson, Arizona, but so far, authorities have only been able to obtain Google Nest video from the front of the house, showing a masked man approaching her front door.

Pima County Sheriff Chris Nanos said investigators have pressed the tech giant on whether additional video can be recovered, but the company admitted, “We don’t think we can get anything,” the sheriff told NewsNation on Tuesday.

Investigators examine a surveillance camera mounted on a neighboring home near Nancy Guthrie's residence.
Investigators examine a surveillance camera mounted on a neighboring home near Nancy Guthrie’s residence.James Keivom for NY Post
Nancy didn’t have an active subscription for her security cameras, making the process of retrieving video especially delicate, Nanos reiterated.

“It’s like peeling paint — you have images over images over images. And you’ve got to peel back very easy because you might destroy the layer you wanted,” the sheriff explained.

However, he holds out hope that further video could provide the key to finding Nancy, after the footage released last week generated nearly 5,000 tips.

The search for the missing matriarch has entered its 18th day.

A photo of Nancy Guthrie from Instagram.
A photo of Nancy Guthrie from Instagram.Instagram/savannahguthrie

Man in a maroon shirt with white hair gesturing while speaking.
Sheriff Chris Nanos has claimed that the case will be solved.NewsNation
Still, Nanos insisted he has “100% faith” that authorities will crack the case.

“If you were the guy, if you were that monster, you should be worried,” he said.

Here’s the latest on Savannah Guthrie’s missing mom

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A reward of up to $100,000 has been offered for information leading to Nancy’s recovery or the arrest and conviction of her captors.

On Tuesday, authorities were handed a fresh setback when DNA recovered from a glove found two miles from Nancy’s home failed to provide a match in the FBI’s national DNA database, CODIS.