LOL. But yeah they'll know if its opened but I've heard stories of people who sent back their wii's with no stickers hiding the screws and they still got it back fixed...
i heard something like that too. Some guy shorted out his wii adding in a modchip, and he returned it to nintendo and they replaced it.
give them an offer they can't refuse.
"There are two things that can go on my wii, a warranty sticker, or your brains."
godfather <3