Federal authorities are investigating the possible purchase of a burner phone by Brian Laundrie the day he went missing, according to reporting from TMZ. Sources told TMZ that the FBI visited an AT&T store near the Laundrie family home and seized surveillance footage. The report indicates that Laundrie entered the store on Sept. 14 with an older woman and purchased a phone, which is the date the Laundrie family says they last saw him. Laundrie family lawyer Steve Bertolino told Fox News that the FBI is in possession of a phone purchased by the Laundrie family, but declined to say...