If you read the DPI website, it says they can still sticker you, and can be inspected here etc. I believe that if you buy a car with interstate rego, if you by it in another state, then you have 3 months to change the rego I beleive, but if you buy it here, with interstate rego, then it needs to be immediatly changed, IE: you need a a temp movement permit to be able to drive it to the pits, regardless of the fact that it's rego'ed in another state. Weird rule, but a mate had to deal with it, drove the pits with the plates then told he had to get a temp movement permit (and he'd been driving it around in the few days before).