I dont think they do accident tracking like the US / Europe. There you can go on websites and look up a vehicle by the VIN and see any repairs. There is no such tracking system here to my knowledge. That said, just take some pictures if its scratches and get it repaired. If the buyer asks, you can simply show him you had the minor paint defects fixed and they would be pleased with that.

You should have had the repairs paid for by the people who hit you. If you make your own insurance company pay, it will come out of your pocket for the deductible.

Also, as someone has pointed out, if you had police reports and paperwork for the repair authorization and waited too long you will need to do that all over again.