I have bought a couple of cars from NSW. I had to hand the NSW number plates in to get a permit to drive the car home to Queensland as they could not transfer the registration to me as I did not hold a NSW drivers licence or address. The car had a NSW blue slip for the permit. Also had to write down and tell them my route home.
Sydney to Brisbane I was pulled up 4 times and questioned why I had no number plates even though the large sticker/permit was attached to the windscreen. The Police just checked out the sticker and all the papers, no dramas.
Brisbane to Townsville I was pulled up three times again no problems. I got the Queensland road worthy done and reregistered the car and because it had no plates it was checked out at Qld Transport.
cheers