Experts at the Federal Bureau of Investigation lab in Quantico are testing items of interest that could help lead law enforcement to Mariah.
The father of 3-year-old Mariah Woods, who was reported missing early Monday, told a reporter that he's suspicious of his daughter's disappearance from her Jacksonville, North Carolina, home.
A statewide Amber Alert has been issued for Mariah.
Woods is described as a white female with brown hair and blue eyes, about 2-foot-9 weighing about 30 pounds.
Once they realized Mariah was missing, Woods and her live-in boyfriend called authorities.
The home is just west of Jacksonville and Marine Corps Air Station New River.
Several hours after releasing the photo taken from at a Walmart in North Carolina, investigators confirmed the child is not 3-year-old Mariah Kay Woods, who was last seen at her home late Sunday night.
"More than 225 investigators, agents and other law enforcement employees are working around the clock with one goal in mind", Onslow County Sheriff Hans Miller said.
Mariah Woods was last seen on Sunday evening at her home in a mobile home park in Jacksonville.
Sheriff Miller is also urging the public to comb through their own properties for clues. "(I) just to be able to touch her and hold her and not let her go again.
The FBI says that law enforcement officers and dive teams were searching a wooded area that surrounds Southwest Creek for three-year-old Mariah Woods on Thursday.
Jetta Long revealed that her daughter was born with a shortened leg, so she said she understood how her little girl could have been mistaken for the missing toddler.
Authorities said they've interviewed Woods' family members, but want to know if you have had contact with them. "As a small community that we are, we got to all stick together in this".
The FBI said they found some items of interest that they are testing for "evidentiary value". Authorities said they would not confirm those details in order to protect the integrity of the investigation.
But Mariah's biological father, Alex Woods, expressed doubts that his daughter was abducted, according to WCTI.
Throughout the course of the search, investigators have used everything from drones, helicopters, and K9 dogs in the attempt to find the Mariah. He said he custody of the children for around a month a year ago after an incident that alerted Child Protective Services, but when Hunter got the kids back, she reportedly wasn't cooperative in allowing Woods visitation.