Honestly I doubt they bother with that when they can just randomly smash open 10 cars to check them in the time it would take to do a Bluetooth scan.
Have you seen how these people work? They drive up, stop next to a car, tap the window with a window breaker, pull the chair down to look in the boot, grab anything they find, then drive off.
In and out within a minute. No time to be dicking around with Bluetooth scanners to see if there are MacBooks around.
Suffice it to say I have talked, personally, to enough bippers to understand that there are 'spotters' and 'bippers', and which one uses the cell-phone based Bluetooth scanner (which requires no 'hardware' or 'effort' to figure out the source of a BLE signal.)