Side note when I worked at Bestbuy they used to have me check the 360s for returns.
Some jobs I could see there was tampering, but they did a good job so I'd let it go.
This one time the serial sticker by the usb ports didnt match the back, and you could clearly see where it was peeled back and there was hair under it.
Dust and cobwebs in the usb section. Mind you this is a next day return. Supervisor asked am I sure? I pop the plastic tabs and the thing fell apart. Nothing was screwed down, dvd drive enclosure as well.
I took the opportunity to take the ribbon cable on the dvd drive since I bent and damaged my friends.
Of course in the end they got a new one because they just kept complaining.
But yea, check them stickers. But even then, look closely because 2 minutes a hair dryer and a razor will make that sticker check meaningless.