If you purchased car last weekend, why do you say it's not finalized?
In some states (Oklahoma for sure) you can drive away with a car before financing is finalized...the dealership has 14-21 days to figure everything out and they don't have to tell you it is not finalized, many will tell you though. My mom traded in her truck, drove off the lot in a car and 13 days later they called her because "some paperwork needed to be signed" and asked for her key to go doublecheck the VIN, someone else came back with all the belongings in her car and they sent her on her way. And they already sold her truck so they mailed her a check 90 days later with the trade in value ($9000 vs around $13.500 private party) minus the "mileage charge" on the car they took back.
Sorry for the ramble, there's nothing worse than seeing your mother in tears after being publicly humiliated and made to feel like a 2nd class citizen. All this happened with all of her scores hovering around 620..