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Their holes are too big. It's mostly just leaking. They're also demonstrating the nodes of the box, which dominate a lot more than they do in a tube. The fundamentals of a tube are related to length and width; the fundamentals of a box are related to length, width, depth, angles in between, etc.
I think there's a reason every college science recruitment team has a Rubens tube but nobody has a "Rubens box" - to get uniform-enough distribution combined with a cavity whose effects don't dominate is a bitch. Rubens tubes, on the other hand: