It's about going down to the basics to gain a better insight.
That's what I'm trying to do.
No, it seems what you are trying to do is discard basically all of actual science, and pretend everything is the air and only ever pushing.
The problem is that when you get down to the basics you see that that idea of it all being the air is pure nonsense.
Just dig further if you feel the need.
At which point you just insult us and claim you have already explained it, or just deflect.
For example, just like you did when we kept digging for:
How air explains inertia,
How there is a pressure gradient in the atmosphere,
How the air pushes an object down, in direct defiance of that pressure gradient (and several key things related to your attempt at an explanation, like why an object placed against a wall isn't pushed into the wall by the atmosphere),
How displacing more air causes less weight not more,
How an object in a vacuum chamber (i.e. where their air pressure is reduced) weighs more, rather than less,
How an object immersed in a denser fluid which needs to displace that fluid also weighs less, rather than more as you would expect due to displacing a denser fluid,
How a chain link holds itself together without any pulling force,
Why some materials are magnetic and not others (and that is while still ignoring the finer details of the different possibilities regarding magnetism),
Why magnets have 2 poles, commonly labelled North and South, such that if you bring 2 magnets together with one's N side facing the other's S side, they attract, but 2 N sides facing each other repel and 2 S sides facing each other repel.
It seems the more we dig the more you insult us and dodge.
So again, for you it seems to just be about avoiding reality at all costs.
Ok, so now we've got to that you can see how a scale measure of these boxes will produce different results in terms of resistance to atmospheric pressure upon them by using a scale plate as the foundation/resistance to that push back of atmosphere against displacement of it by the box's own dense mass.
Likewise, we can use an airtight box, and see how pumping out the air causes it to weigh less, not more like your nonsense expects.
This shows that displacement of the atmosphere causes an upwards force, just like the basics would predict based upon the pressure gradient of the atmosphere.
The basics tell us that because the pressure is greater the lower down you are, the atmosphere will apply an upwards force, not a downwards force.
For some reason you keep ignoring these basics because they show you are wrong.
If we place the box on the ground we can sume the box is being crushed from all sides by the atmosphere, except the underside which is flat against the ground.
So if we place it against a wall, the atmosphere will push it into the wall.
If we place it against the ceiling, the atmosphere will push it into the ceiling.
And in mid air, the atmosphere will simply try to crush it.
In fact, when it is against the ceiling, "nothing can push the box down, except for the absolute minimal stray and tiny available pressures that can seep above it which is almost irrelevant.
What is relevant is the resistance of that box structure in using the ceiling as the structural resistance to the all round crush back of its own displacement of atmosphere, minus any atmospheric volume it already holds."
But back in reality, the object is always pushed/pulled down (ignoring effects in addition to weight).
If we were to place that same box in water then the water becomes a resistance to the atmospheric push back on the box's displacement of it, meaning the box now also displaces the water by pushing it out of the way and raising it to crush back to arrest that push, unless the atmospheric displacement by the box is such that the water cannot overcome the atmospheric push/crush down.
Why?
Why should the water push the object up while the air pushes it down?
If we place the box on the floor of a pool we can assume the box is being crushed from all sides by the water, except the underside which is flat against the floor.
Basically nothing can push the box up, except for the absolute minimal stray and tiny available pressures that can seep under it which is almost irrelevant.
What is relevant is the resistance of that box structure in using the floor as the structural resistance to the all round crush back of its own displacement of water, minus any water volume it already holds.
So not only does your explanation fail to match reality, you need to contradict yourself.