Transferring Rego to NSW

[chester ver2.0]

Rego papers are not proof of ownership, even Dpt of Transport don't recognize them as proof.
What you need is a receipt with the vehicle make, model and VIN noted on it. The rego documents will then just be used as supporting documents.

As for the rego; buy it registered, that way the previous owner has to supply a road worthy and gas certificates and stuff. The day you collect it they can then go into Qld Dept of Transport, hand in the plates and get a refund on the rego not used.
https://www.qld.gov.au/transport/buying/unregistered/uvp/

I would strongly suggest that you get the permit in NSW though, in QLD they are $31/day, in NSW $22 for 28 days, both have CTP on top of that if applicable. The permit issued by either state will cover you for the whole trip, both sides of the Tweed.
http://www.rms.nsw.gov.au/roads/registration/unregistered.html#UnregisteredVehiclePermit(UVP)

Rego papers with the completed change of ownership details on the back are proof i just sold the camper trailer and went through this