I bought a galaxy s4 off of eBay and I looked at the back of the phone under the battery and it doesn't have the typical information sticker. All it says is the model the imei, SKU, FCC ID, and made in Korea N28 CEO168. I just would like to know If its not genuine. Its an at&t model, white frost 16gb. Everything else looks okay but I thought that it was a bit weird not having the usual sticker.