That's something I thought about but there is no evidence that would lead that thought

The kids souls are attached to the toys or the toys have something to do with the kids otherwise the toy box has no need in the story or that’s where the kids would hide or the kids body’s were stuffed in side the box if so the mom figure pulled a William afton lol that’s my guess but I’m going to look at it for a hour or so

Wiat omg that might not be a rug under the TV table! Is that a door? Leading to a basement possibly? Could that be where the last child is?

Are these kids siblings? Or are some of them siblings and others visiting? Or an only child who invited three friends over? Any hints on with one could be related to anyone?

One of them survived or escaped where would they be found? We never see behind the door it's never open an interesting detail we only see people who enter with the door closed then gone