My understanding is that a concealed weapon is on concealed on your person, not in a locked box. You need to have it locked in a case in order to travel by law.
The same thing happened at the Democrat convention in Denver. The case was never submitted to the DA, but it was a royal pain. He was originally arrested for having a concealed weapon - in a gun case.
http://www.9news.com/rss/story.aspx?storyid=99744
Additionally, someone else was arrested in NY or NJ for a gun for a flight that was diverted there from the intended destination (Manchester, NH I think). The charges were eventually dropped.