That tells me someone removed the plate. Good news is, it's probably genuine.
That plate is NOT the Vehicle Identification Number (VIN), it's the Shelby American Serial Number. You WILL have a VIN or CVIN on the car in a few other places. Look on the door A-pillar and/or B-pillar, on the cowl, front fender clip (as shown in the pic with the star at the end of the VIN), etc. Usually the rear axle will have the VIN on it too, if it's the origainal axle housing. Engine, Trans, Rear axle, Body, (sub) Frame and one other place which I can't remember. Those are called a CVIN, for "Confidential Vehicle Identification Number". Authorities use the CVIN to ID a car that someone removed the VIN from. In Calif. you can get a VIN verified by the Calif. Highway Patrol (CHP) Stolen Vehicle Officer. I know there's one in the Salinas office. Your state (if not CA) should have a counterpart to the CA CHP Stolen Vehicle Officer. Or your DMV may be able to help but most times they'll just send you to the State Troopers.