Did you lift the black plastic flap that's right behind the seat bottom? It's basically just a sticker with the serial number and manufactures code. On 2001 and newer EZGO's it's under the seat but will still have the two holes in the glove box where they used to be located. On older EZGO's it's located in the passenger glove box and is a metal tag. If it's not in the glove compartment or you don't see it under the black plastic seat flap someone removed it.