I bought my black Macbook, and a Canon printer on the 25th, because they had a sale going on. Now I have to send in my UPC barcodes on both the Macbook and the Canon printer. The problem is, I can't seem to find out where the UPC barcode is on either. Also, it says to cut them out, but if I do, will it mess anything up if I have to return it, or sell it, or use Applecare? Thanks in advance.