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Clearly youve never bought anything from Amazon, had this loads with a box multiple times the size of the item.
I guess for them they have x amount of set box sizes and postage charges internally and they use whichever box/charge is the smallest sue to the bulk that they send things out, probably cheaper to have a a few options than loads of fit to size options.
They even sometimes will send stuff out not in a box if the suppliers box is good enough for shipping itself.