Is this something you need to be 100% accurate about or live in fear about? I follow the laws to the best of my ability; the last thing I want to do is get in trouble and cause backlash at work as an example.
In my personal experience the answer to the question is highly situation specific. I saw a guy in a Toys R Us store reach for a toy on a high shelf which exposed his CCW. A lady there used her cell to call 911 and, within minutes, there were cops everywhere. They cited the guy.
In other situations and circumstances I have seen a carrier "made" with no particular consequence. MY advice is to ensure that concealed means concealed and don't allow the issue of "flashing" to raise at all.