Maybe going off on a bit of a tangent; but I start every "new/casually interested shooter" off by taking a bit of the mystery out of the autopistol by field stripping it. "See this barrel? You stick it in the spare tyre well of your car or some other obscure place, anyone finding the rest of the gun is now a long way away from having something that can fire." Sure you can mailorder a barrel but it presents a barrier to getting a running gun even in excess of the thin tinfoil "safes" everyone's bolting down.
Theft of an expensive-to-replace and denying a casual thief (including a kid) an operational weapon can be thought of as independent problems.