The other possibility that I've seen a lot lately, people buy both, switch the parts in the boxes and return the cheaper, lesser part in the more expensive box.
I’ve had a variation of this when buying from Amazon. I’ve received things that were clearly opened and one piece taken out. If the retailer doesn’t check the return, they will send it right back out the way it came in. I’ve noticed Costco getting more picky about looking in boxes the last couple years where before returns were simply scanned and set behind the counter.
