As we reported, the Teton County Coroner was conducting the autopsy Tuesday on the remains cops found over the weekend in Grand Teton National Park. The Coroner's Office is now confirming the body is Gabby's. Attorney Richard Stafford said the same.

Before today, the feds simply said they believed it was Gabby. You'll recall the corpse was found near an area where the white van she and fiance, Brian Laundrie, were traveling in was spotted.

While Laundrie has not yet been named a suspect, the FBI is conducting a manhunt for him. As you know, Laundrie had returned to his parent's home in Florida ... without Gabby.

Plus, the guy has mysteriously disappeared without a trace ... although, there was a potential sighting this week. A man in Baker, FL reported that he believed he saw a man matching Brian's description pop up on his deer cam ... some 500 miles away from North Port, FL, where Brian lives.

Gabby and Brian had been on a cross-country road trip together for months now -- documenting their stops in a white van they'd taken out. Another thing that was also caught on camera was an alleged domestic disturbance ... the aftermath of which a police officer filmed on his body camera upon pulling them over.

While Gabby was distraught, Brian denied he'd hit her ... despite a 911 caller claiming he did exactly that. In any case, the cop cut both of them loose after they both refused to press charges.