I don't know the exact RTA (NSW) requirements, but my understanding is that when registering an unreg car it needs to match prior RTA records for them to register it, or you need to prove it was previously registered in NSW or another state by showing old rego papers for proof.

Obviously if you are a scammer, you are not going to have old rego papers, but if you can steal numbers off a recently de registered car it will still be on RTA system.


Steve