To make a long story short, I bought a factory nav from a member here for my 08 GT500. They claimed that the Navteq disc was inside the unit when they shipped it, but when booting the unit up it says the disc is missing and to insert one. Does anyone know if its possible for the discs to dislodge during movement/shipping, or is this guy lying by saying it was inside the unit? Any help/info would be greatly appreciated.