Signs a car for sale may be dodgy include evidence of grind marks, scratching or over-stamping on the vehicle's engine number, chassis number, vehicle identification number (VIN) or compliance plate. Check if the vehicle's identifiers match those on the registration certificate. The registration number, engine number, VIN or chassis number should always match. If not, order an Information Brokers vehicle report to find out if something may not be right with the car. For a small price it could save you thousands of dollars in the future. Information Brokers is accredited with asic.gov.au as an information broker, and is an accredited registrar with auda.org.au.