^^ You gave me the idea and I looked into it further. If you have the google toolbar, try this: get into the gucci website and then type the serial number into the toolbar search box. Next to the box there is a search button that expands into a menu, open it and then click on "Current Site." Google will then search for the serial number specifically on the Gucci website.
Another option I've tried that sometimes works is going to the Google homepage, click on Images above the toolbar, and then search for the serial number with the word gucci. It will list all images that it can find matching that serial number. Keep in mind though, it will post images from fake selling websites too.