haiya, some of you guys dont be so mean la.. TS,just take this as a lesson to do proper research before buying something. Yes, some peripheral do have different revision update of the same model. Altho the mystery of not able to register the other 2 mouse, have you ask the seller why?
Anyway, if this make you cant sleep at night,then continue probing the seller,else just move on. Im sure theres more things in your life to be concerned with.