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Honestly I just assume that those two are where people dump cars, I would never buy a car from either of those without an independent checkup or a warranty.
Also, the initial screening is not the only inspection that carmax does, if the issue is as pronounced as OP implies it’ll probably get caught and sent to an as-is dealer auction where people know that crap cars are sent.
Sometimes I go into my router’s logs and look at the firewall messages where it blocks all the traffic my printer tries to send to the internet with a smug look on my face