A simple box, nothing noticeable about it. Not many will even try to look inside it.
Box.
Very few know what is inside.
Puzzle box.
But when opened, there is a distraction.
Jack in the box.
There is a disguise on that jack that hides the true face, creating a facade for what's inside.
Mask.
When you take of that mask, there is something else that also distracts. It babbles on and on.
Chatterbox.
The few who get past that will see the real inside.
A quiet introvert, with the masks of an extrovert, hiding what's inside.