If the item is evidently faulty, then I tend to find that PCW will do an exchange or refund. Don't go in there with gun's blazing as this will course more harm than good, politeness is the message of the day. Regarding the sticker incident, this seems to be a failure with PCW at times, as to where the sticker is placed, and I agree that I have witnessed this on 'upgrade' boxes. I do not think this is intentional,more of an oversight. If the box as not been unopened, and the seals intact, so that the item can be offered for resale, then you should fair reasonably well. Remember that PCW like to see the original receipts, before considering any action. Surprising the amount of people who turn up with guns blazing, no receipts, and because they think PCW are partly to blame for the error, demand immediate satisfaction.
Would suggest that you could have got a better priced deal from someone like Ebuyer, PCW are not the cheapest for certain items.