A while back there was a Fed out on the west coast that was threatening enforcement for guys who didn't check the required documents per the FOM. The fed even went back and asked jumpseaters with a cabin seat if the capt had checked their documents. I heard this while I was checking in asking for a jumpseat myself. The capt was almost apologetic that he was going through my docs so carefully, but he didn't want to risk a violation. The point is that it is not always an ego thing when you get asked, it is just a by the book process, and if someone asks to see your docs just smile and comply.