Be careful what you say to an FOI or AWI on a ramp check, however in all cases be honest and don't let them intimidate you. If you can't answer their questions be very direct and tell them that you don't know the answer.
If they are going to issue you with an NCN , take them to task there and then and get all the details. The gestapo behaviour hopefully will become a thing of the past. There are some good people in CASA who are trying to make a consolidated effort to turn the reputation of the place around, sadly these people have been the minority up until recently. As a result of the governments response to the review and the new DAS starting on Jan 1, I recon there might actually be a major reshuffle internally , a clean out of dead wood and even some good jobs for younger people with industry expertise to join CASA to help make the industry a healthier environment to work in.