After today's discovery, I'm wondering how much the Laundries did cooperate with LE. I thought BL was on the Appellation Trail and couldn't understand why all the focus and money was spent on the searches at the Reserve. Now, I suspect the Laundries were honest about where BL went and kept insisting to LE that he was there so they kept on with the search.
I can think of several stories BL could have spun to get his parents to stay silent. I can also think of several things he could have said to get them to not take calls from GP's parents. Until the FBI names them as part of any investigation, I'm holding out judgement on them until remains are identified and time of death is given.