I'm wanting to purchase a brand new Macbook Pro 15" from my friend, one which he got it from his insurance claims. Its brand new and not opened. I entered the serial number online to check the warranty status but it returns as invalid, I'm assuming this is because I havnt opened the registered the Macbook yet? If this is the case how do I find out the purchase date of the Macbook so I get an rough idea of when the warranty will expire? thanks!