Espinoza said the organization has sent fingerprint samples to the Federal Bureau of Investigation for absolute confirmation of the body's identity.
April Burton, her sister-in-law, spent the week in Costa Rica with Stefaniak.
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Espinoza shared no details on what police uncovered, other than to say they have reviewed surveillance footage and interviewed anyone they could find who had contact with Stefaniak.
Her brother flew to Costa Rica last week to assist authorities in the search. Caicedo said the information made him suspicious as his sister's flight was scheduled at 1:30 p.m. local time and she was not known to arrive early for anything. Her body, covered in plastic bags, was discovered Monday about 300 yards from the Airbnb where she stayed. Investigators further confirmed that they had done a search of Martinez's room, but they did not provide any details about what they found.
Friends and family grew anxious when Stefaniak didn't answer messages wishing her a happy birthday on Wednesday, CBS News reported. She Facetimed a friend in NY, telling him she was going to ask the security guard to buy her a bottle of water.
Martinez was reportedly staying in the room next to Stefaniak and gave contradictory statements when questioned by police. "We want the world to know that we will never forget Carla", the post on Finding Carla says.
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Authorities found Stefaniak's body around noon Monday in a wooded area of the San Jose neighborhood of San Antonio de Escazu.
Authorities said Espinosa Martinez was also a security guard at the building.
During an exclusive interview with ABC Action News, Stefaniak's father, Carlos, said his heart shattered when he saw her body.
Investigators performed an autopsy Tuesday, and plan to work with the Federal Bureau of Investigation to match fingerprints to formally confirm the body belongs to Stefaniak.
The man, who is a Nicaraguan national, was staying in the apartment next to Stefaniak's rental. We're going on six days not hearing from her.
"Words can not express the devastation within her family and friends", the Facebook post said.
An autopsy completed Tuesday determined the body initially matches Stefaniak, but investigators still need to complete a final verification, said Walter Espinoza of the country's Judicial Investigation Department. Stefaniak had also checked into the flight, Jaime said, which she always did.
The night before her flight, Stefaniak took an Uber ride around the town and then was dropped off at an Airbnb.