Sir if you have a brand new vehicle, unregistered, and zero meter driven, you can sell it for a premium that is prevalent in the market price. This premium is illegal because it is not documented in the final papers that are delivered to the owner or when the car is being registered.
Other than that, the whole of Pakistan charges premium on cars. Yes, it is as easy as it looks and sounds. There is no penalty except the profanities, bud-duaien, and anger that the prospective buyer will harbour towards you.