3 day payoff program

I’m trying to get a car from Carmax and after submitting my application, i got approved from Carmax finance but I didnt like the terms and i got a call from the sales agent who told me about a 3 day off program to shop for a loan from my bank or credit union . My question is can I go Carmax and drive off with the car without paying a down payment or anything and return it back in 3 days if I get rejected from my bank maybe