Found this:Originally Posted by Tek720
Q:What if my system wasn't electronically registered at the store?
A:You can use our warranty lookup tool to determine if your new system has already been registered, and what its warranty status is. In the rare case that your new system may not have been electronically registered at the point-of-sale, your warranty is determined by your purchase date. There is no need to register or send anything to activate your warranty. If your system needs repair, a representative will assist you with your repair options based on your date of purchase. If you have any questions or concerns, please e-mail Nintendo's Consumer Service Department.
Attention Wii Owners! If you register your newly purchased Wii serial number on your My Nintendo account, you will receive a free 90-day warranty extension! This 90-day warranty extension is exclusive to newly purchased Wii consoles and not available for any other system.