Things You'll Need
Instructions
Unplug all cords from your Xbox 360.
Turn your console upside down and look for a small notch in the faceplate.
Insert your finger into the notch and pull the bottom of the faceplate away from the console base. The faceplate is oftentimes solidly attached. Therefore, if you have a screwdriver or Xbox 360 console opening tool handy, use them to avoid injury to your finger.
Pull the upper section of the faceplate way with your fingers and set the faceplate aside.
Look toward the bottom of the console face. You should see a small, rectangular "Microsoft" sticker. This is the warranty sticker. If it is torn, the previous owner opened your console for modification.
If the previous owner sent their console into Microsoft for repairs, the technicians would have replaced the torn warranty sticker with a new one. A torn sticker always means consumer tampering.