Posting and spatial awareness
Here's another version of "posting".
By physically being able to climb into the box after the fine motor part of the activity, Little Joha uses her entire body to observe her surroundings (spatial awareness).
If you have a large box, simply draw a human face on top, with a hole for the mouth, and "feed" it. Then take the dry pasta ot pompoms out of the box and play again!
Just stay close all the time because small items can always be a choking hazard.