Yea, I think it's possible everybody is overlooking one key factor. Are you going through a router? The reason I say this is because your router has a MAC address spoofed to it of whatever box you tell it to. That means to the outside your MAC looks like one thing, but it's not actually the MAC of your Xbox. Thus, swapping the eeprom would not work, if anybody currently has a ban, could you put this theory to the test? Just go into your router settings and spoof the MAC of a different box to the router, as long as your Xbox is legit when you do this you should be good. I have used this technique to get around bans with PS2 in the past. The spoofed MAC is the one they will "see"