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I've been watching from the sidelines on this. Here's how I see it. The buoyant force is exerted by a fluid on objects partially or entirely submerged in them. You can calculate this by using the weight of the fluid displaced, but the mechanism for the force is the pressure difference between the bottom and top of the object. No gravity--no buoyant force, because no pressure difference. Now if your box does not allow any fluid beneath it, then you have removed the mechanism for the buoyant force. There is no buoyant force, and the weight of the displaced fluid means nothing.
Am I missing something?