I mean, you're going to have this shit happen continuously. I cannot count how many times when a non-antag civilian goes into maintenance and starts gathering unneeded shit like grenade casings. Unless you're like a roboticist and need supplies for your bots, or something similar in that matter, basic civilians shouldn't be entering the damn tunnels...
They even go into the tools storage shed and start robbing the place of its tools. Why? You don't have a job in engineering. Why the hell are you equiping yourself a full set of tools that someone useful would need later down the road? Why you taking shit from the engineers' personal tool closet? You're not an engineer, why you in here? Why you taking shit from the closets, civs?