I would look in glove compartment for records or call the guy back and asking him about the maintenance. Maintenance should have been the main topic before buying? Did you check carfax? Welcome to the Z family. If its stock that sometimes mean he wasn't hard on the engine. Look around the engine bay for dates of maintenance and tire dates on rubber. Other than oil/fluids most maintenance doesn't happen till about 110K miles(not a mechanic) I do know the MT 370z had clutch problems.
