Did Brian Laundrie's parents tell all to FBI?

Brian Laundrie's parents may have already spilled what they know about Gabby Petito's murder to the FBI to avoid obstruction charges, law enforcement experts have told British rag DailyMail.com:

• Lawyer for Brian Laundrie's family addresses speculation about how easily his dad found his belongings, saying the public "doesn't understand simplicity"
• Brian Laundrie: News and updates on manhunt for Gabby Petito's boyfriend (Daily Mail Online)

News and Updates (dailymail.com)

Christopher and Roberta Laundrie joined the hunt for their fugitive son Wednesday and within hours [the dad found him then] cops had finally located his backpack, notepad, and possible remains in Florida swampland.

Authorities said the breakthrough -- five weeks into the manhunt -- came after receding water levels allowed greater access to some of keen hiker fugitive Brian's favorite trails and hangouts in the alligator-infested Carlton Nature Reserve.

But former FBI Agent Stuart Kaplan thinks authorities issued the Laundries with a behind-the-scenes ultimatum: Help us find Brian or face years behind bars yourselves.

"There's no doubt that Brian Laundrie's parents are fully engaged with law enforcement," Kaplan told DailyMail.com.

"I do believe that there was some sort of agreement where they accepted immunity in exchange for their full cooperation."

Despite a rash of unconfirmed sightings across the US [and Mexico], police and FBI search teams had maintained a laser focus on the sprawling Carlton Reserve ever since Laundrie, 23, was reported missing by his parents on September 17. More