Question

So tonight I made a nice dinner for summer. Ham salad sandwiches on Dave’s killer bread buns and snow crab surimi with maple spicy air fried Brussels sprouts. I got busy watching a show so I put my plate on the counter. 30 min later, half my Brussels sprouts are gone, half my crab is gone, and my entire sandwich is gone. But some is left. I experienced theft in HS from “friends” so they took almost all, but left me a little out of some sort of pity. My mom went off about how someone was here breaking in but I was in the living room (next to the kitchen) the whole time during which my food disappeared. How could someone break into the house and slip past me and eat my food without me knowing?