I think the tag is genuine, the VIN on this car places it within a very few of my Z11, which is an 03D car as well. Be pretty tough to find a loose tag within this time frame (I guess it's possible, but unlikely). If we knew the rest of the VIN and body sequence it would be a bit more verifiable, but it's a fairly high chance of being legit. JMO -
Regards,
Steve