Well I lost my mind and spent far more than I had a right to in this economy, but after a great deal of reading books, forum posts, and mag articles and fighting with myself, I finally went ahead and got the sov gt. It arrived today and now I need to register the warranty. There are numbers : 1) 2 on the end of the box, 2) 1 on the outside of the control box, 3) 2 on the inside of the control box 4) 1 at the bottom of the list of warranty conditions on the back of the card, 5) an item number on the receipt. Some have bar codes, some don't. Oh, and the coil has 2 separate bar code labels also. They are all different, no two are the same naturally so I should probably call Kellyco or minelab directly but just out of curiosity, what numbers did any of you sov owners use.