At present there hasn't been anything specified as an object to indicate that status, but given the size of the Empire it would certainly not be unreasonable to have such a thing.

With it he'd be able to fool most people, though those in the know about the current state of the Nobility would see through simply possessing an item. That would be quite a small number of people though. Alessia would be one of them, and in fact, she may even know of his particular case (the outsiders view at least) if you take that road...

The key thing to remember with Kalesian nobility is that it is not guaranteed that one will inherit the status - the full write up is in this [url=http://www.roleplayerguild.com/topics/54728/posts/ooc?page=68#post-1793137]post[/url] if you're interested.