TUCSON, Arizona — Federal agents possess images and identities of individuals who fit the description of a masked figure captured disabling a home security camera hours before Nancy Guthrie vanished. Authorities recovered the key surveillance footage on February 10 after it had gone missing initially. The video, from the early morning of February 1, shows the suspect, believed to be a man about 5 feet 9 inches to 5 feet 10 inches tall with average build, approaching Guthrie’s front door. He carried a black backpack and what appears to be a holstered handgun.

Blood on Guthrie’s porch and a disconnected door camera marked the first clues in the case. Now, investigators have circulated those photos and names to local gun shop owners and businesses, CBS News reported. Philip Martin, co-owner of Armor Bearer Arms in Tucson, received a packet from an FBI agent between February 10 and 12 containing 18 to 24 driver’s license images and social media pictures. Martin checked his store’s purchase records from the past year. None matched.

“Based on that video I saw of the kidnapper at the house who was caught on camera — the facial hair that I saw on the video reminds me a lot of these photographs,” Martin told KOLD, the local CBS affiliate. Pima County Sheriff Chris Nanos pushed back on rumors of 40 named suspects. “We haven’t narrowed it down to anything other than we have pieces of evidence that we’re looking at to try to find this individual,” Nanos told Fox News.

Detectives are analyzing biological evidence from Guthrie’s home, the Pima County Sheriff’s Office said Wednesday. New DNA, unrelated to Guthrie, turned up in a recent search, police sources told the New York Post. A glove found near the property resembled the suspect’s handwear from the video. Tests against the national Combined DNA Index System came up empty, Nanos said.

The reward for information leading to Guthrie’s safe return or her captor’s arrest climbed to $202,500. An anonymous $100,000 donation joined $100,000 from the FBI, $2,500 from 88 Crime, and another $100,000 pledged earlier by Milwaukee Crime Stoppers President Michael Hupy. The sheriff’s office did not confirm if Hupy made the latest contribution.

Media outlets received ransom notes purportedly from the kidnappers. TMZ reported Wednesday on a “sophisticated” demand for $6 million in cryptocurrency, not Bitcoin, with graphic threats if unpaid. The note thrust news organizations into the negotiations, TMZ stated. Local Arizona stations and TMZ got earlier notes seeking millions in Bitcoin.

False leads have frustrated the probe. On Saturday, a SWAT team raided a house near Guthrie’s, searched a gray Range Rover and questioned its driver along with others inside. No one faced arrest. Nanos tempered expectations Tuesday. Investigators lack proof of life or death. “They ask me, do I have proof of life? I ask them, is there proof of death?” he said. The sheriff warned the case might drag on for years but vowed no letup.