New DSi's do come with two styli. The only thing I can think of to check is to make sure the touchscreen works alright. You can just use the tip of your fingernail to test it if you don't have a stylus. It should work fine, but couldn't hurt to check. You may want to check for scratches on the screens, primarily the touchscreen. You may want to also check the camera lens and camera functionality. Other than that, I can't think of anything.