Providence and Logan are corporate stores, since they participate in the FL driveout/in. Having a car with NJ plates shouldn't matter. If PVD has a specific car to send to Logan, it might be that Logan called for help in filling a reservation of that size class. Or perhaps the car needs non-essential servicing, and maybe Logan has a bigger maintenance facility to handle it. It would have been interesting to ask them why they wanted to send that specific car.
National has relatively few neighborhood stores, although they do have one in downtown Boston. So if one branch is running low on a type of car, it's presumably harder for employees to move stuff around.