Well..at the end of the day its totally up to you as you are the only one who knows what the car is like and how it gets used and will be used.
If I brought down a car which I selected in Japan (where I would know what the actual mileage of the car is, trust when it was last actually service, etc...), based on how I would use the car, I would just do in the lines of what the agent says....just do a basic inspection just to make sure that nothing has gone wrong under the new running conditions.