Unless he had disabled his OnStar (which he may well have done, for privacy), LE should have access to all his travels with that truck.
Now LE may have the OnStar data and they may not. For him to be placed at Whiskey Bay tells me that either they do have the info, or there was a witness. If there was a witness, then BSL was extraordinarily unlucky.... the bike dump spot is pretty isolated.
The problem for LE is - even if they DO have his OnStar data - - the guy traveled all over the place! The area to search is so massive.... The one thing they would have is that OnStar does show if you stop. They'd have to search around every area he stopped.... a doable task. of course, if he had a boat, all bets are off, but I've seen no info that he had a boat.
But if BSL's OnStar was disabled, then I think there was a witness at Whiskey Bay - and not much else to go on.... and finding Mickey will be difficult
lease: