Every state is different but in Queensland at least when you go to the Department of Transport they generally (after you have paid the fee of course) give you your last 5 years' traffic record. Only if you ask for your full record will it be produced for you.
The Police on the other hand have access to your entire history so if you do happen to find yourself before a Court the Court will be informed of your entire record not just the last 5 years. Previous entries and convictions do not drop off.
And I was not attempting to be smart by asking how much you thought a lawyer would cost. I was genuinely interested. What I can say in response is that for the sum you quote you aren't going to get anyone of any particular substance, experience or ability.