I'm a dad of teenagers.
It. Drives. Me. Insane. How often things just "disappear."
I don't mind them using tools, or paints, or eating whatever they wanna eat frankly, but not putting stuff back where it was or putting an empty box back in the fridge or cabinet, holy shit.
It makes me feel insane, like "I know that I have a pizza peel, where the hell is it?" Tearing the kitchen apart....
That said, if it were a pasta strainer in my second house and my kids were adults staying with their spouse(s)? I mean... C'mon. I know I raised them to be considerate, so if it's missing at that point, it's on me.