First off, this makes me wonder what the customs inspectors are checking for, I always thought it would just be people that are not supposed to be there, but I guess there is more to it than that.
And that server would have gotten an extra tip from me....that was nice of him and he certainly didn't have to do that.
I could be wrong, but I believe this is a health inspection that is conducted on a pretty regular basis, not someone from Customs.