The Laundries visited Fort De Soto Park in Tierra Verde, Fla., on Sept. 6 and 7

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The lawyer for Brian Laundrie and his parents has confirmed reports that the family went camping together days after the 23-year-old returned to their Florida home without Gabby Petito.

Attorney Steven Bertolino told WTVT that Laundrie visited Fort De Soto Park in Tierra Verde, Fla., along with his parents, Christopher and Roberta Laundrie, on Sept. 6 and Sept. 7.

Last week, William and Charlene Guthrie, who live across the street from the Laundries in North Port, Florida, spoke to the station, saying the family loaded up their new camper and left town about a week after Brian returned home without Petito, his 22-year-old fiancée.

Gabby was found dead on Sept. 19 in Grand Teton National Park in Wyoming, and officials have since determined her death was a homicide.

On Tuesday, Bertolino confirmed the camping trip happened, saying all three members of the family arrived at the park on Sept. 6 and left on Sept. 7.

"They all left the park," Bertolino told the station.

Bertolino did not immediately respond to PEOPLE's requests for comment.

The station obtained visitor logs from the park, which confirm Roberta Laundrie checked in to a waterfront campsite there for two days. 

Bertolino reiterated Tuesday that his clients have no idea where their son is.

Laundrie, who is a fugitive following the issuance last week of a warrant for his arrest, has not been seen since leaving his parents' home for a hike two weeks ago.

The warrant accuses Laundrie of unauthorized use of a debit card. He was named a person of interest in Petito's case, but has not been named a suspect in connection with her death.

Gabby Petito, Brian Laundrie
Gabby Petito, Brian Laundrie
| Credit: Find Gabby/Facebook

Petito was last seen in late August, while on a cross-country road trip with Laundrie.

Laundrie returned to North Port, Fla., on Sept. 1, without Petito. He has been the subject of a massive manhunt across a Florida reserve, where it is believed he went hiking.

For nearly two months, Petito and Laundrie had been traveling across America in a white, repurposed Ford Transit van. Petito was reported missing on Sept. 11 — more than two weeks after her mother last spoke to her by phone.

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Laundrie and his parents refused to meet with detectives handling the case.

At this point, investigators have yet to say how Petito was killed, but believe she died sometime between Aug. 27 and Aug. 30.

Police believe the relationship between Petito and Laundrie became more strained during their tragic road trip, according to a newly unsealed search warrant connected to the case.

Petito's best friend, Rose Davis, tells PEOPLE the couple's relationship was "toxic," and that Laundrie's jealousy led to numerous fights.

Gabby Petito
Gabby Petito, Brian Laundrie
| Credit: Gabby Petito Instagram

On Sept. 15, PEOPLE spoke with Petito's father, Joseph Petito, who said his daughter was "amazing." 

"She's so artistic. She's an amazing artist. She loves to draw," he said. "She has a great eye with decorating … She's that flower child type of personality. The old soul, you know?" 

"If Woodstock was still going on, she'd still be there, man," Joseph added. "She's a hippie from the '60s, all right? She's a Beatles fan, round glasses … a free spirit." 

If you have information on this case, call 1-­800-­CALL-­FBI (225­-5324).