Genuine paint may not matter much (but then again, buy at right price), however, auction sheet / grade must be at least 4 and above, and the vehicle must be non-accidental with genuine mileage; and preferably low mileage.
Before buying any JDM, get the auction sheet verified, and have the vehicle thoroughly inspected by OLX / Pakwheels cars inspection services, for complete peace of mind, or have some experienced person with you.
Physical condition of car at the time of purchase, and verifiable auction sheet, these both must preferably match.