How can people sell xbox backups already, and have no way to test
them to see if they work if the chip is not for sale, yet?

because the games have been tested to work by the people who make the modchip, and several videos have been released by the different groups (xtender, neox) proving that they indeed do work.

i think its just excited ppl getting ahead of themselves, why buy something now when u cant use it until later!?

u wouldnt buy a xbox game off the shelf if u didnt have an xbox would ya??? didnt think so!