Confused with pressure in closed-box

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SUMMARY

The discussion centers on the concept of pressure within a closed box, specifically regarding the pressure acting on an object (ball A) inside the box. Participants assert that the pressure exerted on ball A is equal to the atmospheric pressure (Patm) outside the box, despite the box being sealed. This conclusion is based on the understanding that pressure is transmitted equally in all directions in a fluid, and the external atmospheric pressure influences the internal environment of the box.

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kbuild
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I'm confused when i consider about this picture in my head.

... imagine that there is a ''closed-box'' on the floor.
And ball A is in this closed-box.
Pressure acted on the box = Patm.

I'm wondering, how much pressure act on ball A ?

With my sense, i think it is Patm.
... but i can't explain! it's a closed-box, so air mass above the box should have no effect on the ball in box ?!
 
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If the box is rigid and sealed from the surrounding air, then the outside pressure shouldn't affect the ball inside.
 

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