Well, based on the (not Amazon, thank the Maker) warehouse I work in, it's mostly that nobody there cares. "Does it fit?" "Yeah, more or less." "Okay, tape it up, chuck it on the skid, and get the next thing!" Especially in an Amazon warehouse where people are so overworked they aren't even allowed to take pee breaks, nobody's gonna screw around looking for the perfect box when the one they grabbed will do.
Well, based on the (not Amazon, thank the Maker) warehouse I work in, it's mostly that nobody there cares. "Does it fit?" "Yeah, more or less." "Okay, tape it up, chuck it on the skid, and get the next thing!" Especially in an Amazon warehouse where people are so overworked they aren't even allowed to take pee breaks, nobody's gonna screw around looking for the perfect box when the one they grabbed will do.