We do use shrink wrap at Best Buy for open items, although we don't always open item returned stuff (We are required to take off some $$ if we sell it as open box, typically if it is an item that has few pieces to it, like maybe a battery charger, that seems to work fine and isn't missing anything, we will just put the box back out,). If it is a sealed item, especially if it is one that we would charge a restocking fee on, we will almost always open item it. As far as the serial number thing goes, we are supposed to check that, but once again, the average CS2 at BB is just a kid and probably doesn't think to do that. We do now own future-shop in Canada, and will probably expand BB into their soon (I swear that I work for the evil empire of consumer electronics sometimes, they keep taking sh!t over)