Is it 47 early, or 47 late?
If it is the art deco body style with headlights mounted on the fenders then the vin is under the hood on the passenger side cowl, along the side. If it is gone, you'll see a couple of holes there (diagnally oposed).
If it is 47 late with headlights mounted in the fronts of the fenders then I'm not certain, but I thought it was drivers door sill?? Not positive about those years.