Also, Barron County Sheriff Chris Fitzgerald asked for 2,000 volunteers to report no later than 9 a.m. on Tuesday at 1883 Highway 25, the area known as Hungry Hollow Grounds at state Highway 25 and 19th Avenue.
The sheriff did not have details on possible license plates.
State, local and federal investigators have been searching for Jayme since around 1 a.m. on October 15.
The sheriff reiterated he believes 14-year-old Closs is still in danger.
"They are the experts in breaking down 911 tapes, looking at our phones and taking care of all evidence in that manner", he said.
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The sheriff's department, state Department of Justice and Federal Bureau of Investigation have been searching for Jayme since she vanished. A spokesperson for the FBI's Charlotte Division told WLOS that digital billboards across the country will soon display a photo of the missing girl. There is an active Amber Alert for the teenager. The dispatcher "could hear a lot of yelling" during the 911 call, which was "pinged" to the Closs home, according to a dispatch log the Barron County Sheriff's Office released Friday. A 911 call was placed from Denise Closs's cellphone. Two vehicles were seen in the area near the time of the October 15 shooting of James and Denise Closs and abduction of Jayme Closs. The teenager vanished early October 15 and her parents were found fatally shot in their home near the city of Barron in northwestern Wisconsin.
He said when the deputies arrived at the house, James was found dead at the door.
The gun used to kill the Closs parents has not been located.
During a press conference Monday, Fitzgerald said a review of video camera footage in the area determined there were two vehicles near the Closs home at the time of the incident.
Jayme's classmates planned to hold a vigil for her Monday evening at the Barron High School football stadium. There will be music, resources for families, and spiritual and emotional care.