The masked person who was seen on the doorbell camera footage at Nancy Guthrie’s home on the morning she is believed to have been kidnapped may have also been at her house another night.

ABC News reports that the suspect was captured on the doorbell camera on the door before Nancy’s suspected kidnapping, according to sources familiar with the investigation. Specifically, the source added that the image released by the FBI of the suspect at her front door, without a backpack, was from the day prior, even though they said there were from “the morning of her disappearance.”

CNN added that the reason for believing this is on two separate days is “because the masked suspect is not wearing a backpack in one of them, according to the source.”

Nancy has been missing since Feb. 1, after having been last seen on Jan. 31 when she was dropped off at her home in Tucson, Arizona.

Arizona Sheriff Responds To New Reports Regarding Security Footage

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Pima County Sheriff Chris Nanos responded to the new reports of the masked subject appearing at Nancy’s house on two seperate days, speaking with Fox New’s Matt Finn.

“The info that it occurred on a different day did not come from the FBI or PCSD,” Nanos told the outlet.

New Theory Emerges On Why Masked Subject Approached The House Twice

According to the sources who spoke with ABC News, the theory is that “the suspect approached the door the first time, noticed the camera and was scared off, only to return later, when he is seen tampering with the device and putting branches in front of the lens.”

The outlet further added that the “gap could help explain why investigators have asked neighbors to check their home security systems for suspicious people and vehicles going back to Jan. 1, a month before the abduction.”

Pima County Sheriff Chris Nanos Says Authorities Are ‘Not Quitting’

GettyPima County Sheriff Chris Nanos
In an interview with NBC News on Friday, Feb. 20, Nanos spoke about the lack of leads in the Nancy Guthrie investigation, but addressed that it is “still growing.”

“In terms of leads and working and getting out there, I think that’s still growing, yeah,” he said. “It’s never fast enough for the sheriff. I want it like you: ‘Come on, guys, let’s go, let’s go, let’s find her.’ But the reality is that I also know that sometimes things take time.”

And he sent a crucial message to the public.

“We’re not quitting,” he said. “We’ll find her. Yeah.”