I recently bought a MBA from a 100% positive eBay power seller, who advertised it as "new". It came in a sealed box and looed brand new. I went through the startup process and registered the product successfully using the serial number. However, when I checked the warranty, it says that it expires on 1/28/10 (only 6 months left). Does this mean that my MBA is used? Is there anyway to know for sure?