You should have nothing to worry about. Just follow directions and be cooperative. The people at the border get off on authority. Don't give them a reason to harass you.
I try to be the nice to anyone in similar situations and not to obstruct stuff because we all have better things to do than to argue over stupid stuff at the border. Thanks for the information, you kinda put me at ease!
If you are too nice and polite, you show a weakness. Dealing with someone who has unlimited power in a limited area is difficult business; I usually act as a polite but a dangerous asshole.