So I'm thinking about buying a CPO M5 in Massachusetts, however I need the car registered in FLA. Massachusetts does not offer temporary plates and I'm not trading in the X so I don't have an extra tag to transfer. Furthermore, the dealer can't apply for the tags until I pay for the car (need a bill of sale) and I'm not going to pay for the car w/o seeing/testing it first. Therefore, how do I drive the car from MA to DC without appropriate plates. I currently have a loaner car that is registered to a BMW dealership in the area, if I just displayed those would it be OK for driving it down on 1 day and then just parking it until I get my real plates?

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2006 BMW X5 4.8is Lemans Blue/Beige/Dark Maple
-Nav, Comfort Seats, Heated Steering Wheel,
Rear Airbags, AUX Input
2009 BMW M3 Space Grey/Black/Carbon
-all options