Check the vin number against what they are putting on the title or what they tell you in an email. (check on the actual car)
Check for curb rash under the sides of the car.
Check average MPH on the multi display, maybe you can see what kind of driver they are. Or the trusty radio preset trick
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Pearl White 2010 370Z Sport, Stillen CBE, tint, K&N drop-in filters, GT-R start button, Kenwood DNX-6980 with backup cam, LED bulbs, Raceseng shift knob.