You are assuming the box is in an atmosphere.
The box itself is your "atmosphere".
Alternatively, if you assert the box itself is contained in a perfect vacuum, you have just subjected the argument to infinite regression. What box holds the vacuum that holds the box?
Have you ever brought up, or have you heard, the 3 doors experiment...in a crowd?
50/50!!!
its 50/50!!! everyone screams at first, because thats what they intuit until deeper reflection reveals that its 33/66. (percent)
Try it on someone.
Theres 3 closed doors. 1 has a prize. You do not know which door has the prize...the host does.
Youre told to pick a door.
The host opens one of the two doors you DIDNT pick, and its not the prize.
He offers you to change you pick before the remaining doors are opened.
Most people, at first, think that by staying with your original pick, youve got a 50/50 shot at winning by staying or switching.
No, the odds that the prize is the other door became 66%.
Sometimes you need to explain why...and heads explode. Its fun as hell