Wii game discs do not have serial numbers. The inner ring has a manufacturing code (e.g., RVL-RZDE-0A-0 / RVL-RZDP-0A-2), not a unique per-unit serial.
RVL = Wii (Revolution)RZDE = Game ID (e.g., RZDE = Mario Kart Wii USA)0A = Revision (0 = 1.0, 1 = 1.1)0 / 2 = Disc layer / Factory code.RVL-RZDE). Search that on GameTDB or WiiDB for exact title, region, version.No serial = no warranty registration, no "stolen check" via serial. GameStop etc. use the Game ID (SKU) for trade-in value.