a notebook found they are laundrie s remains could shed some light on that. a source says the notebook is possibly salvageable. we want to make sure that s handled sass well as possible. reporter: their son left the home on september 13th.the laundrie lawyer said he notified the fbi the same day he left. something law enforcement disputes. making a statement that we haven t seen him is not reporting that information. there is a million things we would have done. reporter: did laundrie s family tell law enforcement anything about petito before he left? that s not something that i can comment on right now and just leave it at that. reporter: we sktill don t knw when laundrie died. they discussed the possibility that it could have been a possibility. we had that conversation, chris, roberta and myself several times. we just do not know. of course, knowing his mental