The jist/vibe I get is that they don't want someone coming in and pulling out their canceled weapon to show it to the employee or other patron.
Yes I have seen this before.... Guy looking at gun and another guy says oh I love that gun I use it as my concealed gun and they whip it out not thinking. No harm was meant but now you have a loaded weapon out of holster... being handled.... Which isn't good. (especially when you don't know the gun smarts of those involved... Like if they were looking for their first gun etc)