MO Rev Stat 571.121. 1. Any person issued a concealed carry permit pursuant to sections 571.101 to 571.121 shall carry the concealed carry permit at all times the person is carrying a concealed firearm and shall display the concealed carry permit upon the request of any peace officer. Failure to comply with this subsection shall not be a criminal offense but the concealed carry permit holder may be issued a citation for an amount not to exceed thirty-five dollars.
If you were openly carrying then the above does not apply.
Well, of course it was a 'lawful request'; the alternative is he asked you to do something unlawful. That doesn't mean you are required to obey nor act upon it. It's a 'lawful request' that you pass the ketchup, that doesn't mean you have to.When he returned, he informed me that "it is a lawful request by an LEO, and that you have to tell them if you have a firearm or not in your vehicle" (not going to argue vernacular on this) so I said "ok".
If he had asked you to display your concealed carry permit, then you would have been lawfully required to comply.... but he didn't.