Hi.
You learn form your mistakes, and they can infact be good for you.
When thats said.
Car: As long as there is no lien on the car or it beeing stolen, you can contact the DMW and get a clear title. But it will cost you some money. Depending on the state you are in. But normally between $75.00 and $100.00 for a new title.
Gun: This is importent, you MUST contact ATF, and clear the gun. If the gun is HOT and you sell it, you are in deep trouble. And you might end up behind bars for a year or two. Gund must be cleared with the ATF.
Both items are easy to sell.