It seems that some of you are jumping on cccdad unfairly. If the park service says "you must have AMA" and there is no way to show the AMA ie: the board, what happens if a park ranger shows up and sees someone flying and no proff of AMA. Will he talk to the flyer or the club that manages the site. cccdad knows he has AMA, but do others? When i travel I follow the club rules. I showed up at a field in Florida one year and was told I couldn't fly unless the safety officer put me on a buddy box first. I said fine. When he showed and saw my 40% he just shook his head and said to fly anyway. They'd never had a GS plane at their field.
As far as the AMA go, they will not get involved. This is a club matter. Reporting him will be a waste on time. On the other hand I see no reason for this person get in a dizzy over such a small thing as posting his AMA card on the board. I know I would if asked.
Enough said, remember this hobby is for fun. cccdad, let someone else talk to him. Enjoy your day with the knowledge that you have done the right thing and let it go. Dennis