Jim, Don't worry about it. Unless you are going to subject your engine to heavy loads for extended periods, like towing or racing, you will never see any exhaust valve recession or more than normal wear in the life of your engine.
If you must know see if a previous owner has the machine shop bill for the head work. It will list the valve seat replacement if it was done. Both parts and labor would be listed. With the low miles on your car it's also very likely that the engine has never been apart.
Other than that and if the previouse owner don't know you would have to pull off a head to physically inspect it.
Tom
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motor rebuild history advice
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