Show me "Ramp Check" in the Regulations.
My advice is don'be adversarial, that never works out well.
I have had three ramp checks in 30 years and one of those was part of a company surveillance. I have just handed them all the required documents and have never had any problems. In one case the Chief Pilot got a letter saying how well I conducted myself.
In one I had to explain the difference between empty and operating weight to the FOI, I still don't think he got it when I was finished!