Tough to find them, especially online. But just a quick sum-up they can sticker any car they think has an "illegal" mod or they "suspect" the car doesn't remain within the vehicle standards rules & regulations.
When you go to the pits, whether its for a new rego or a licky, the inspection will be the same. However, the stickers say what they suspect is illegal & it's what they will look at most. In your case now, because the cops were clueless, they haven't given the pits much detail. When you go there, they will have a look at ur sticker paperwork & think oh goody.
So what I'm thinking at the moment with yours, if it's mechanically good & not too loud (everything plumbed back, no leaks etc), and have a good attitude & explain the story to them you probably won't have a problem. If you think playing ignorant will help you can try it, but remember they will have the rego history etc on the system, so if they go to check on that & see you have have had the car for years, but you told them you only just bought it & they said it was stock, then expect problems.
All I'd advise is make an inspection booking to your nearest centre, do anything you have to with the car & take it there. From what you have said here I can't see you having too much trouble if you are just polite & honest about it all.