in my area a car that clean has never been a $500 car. now if it was rusty then yes $500 car. possibly less depending on condition.
as posted before it's a dealership selling. they will probably get it eventually. a close inspection would be required to see if it's really a clean car and not a perfumed turd.
if it wasn't a dealer selling i could see $5 maybe $6K in my area for a clean old car like that these days.