BSK

i have a question: i have 2 square cables in the trunk sides behind the covers. the drivers side cable has a 10amp fuse and is real thick with 13 cables as far as i remember. the passenger side cable has a 13 pin connector and 9 cables going to it. that should be the cd changer cable right? but its square and not round. any ideas or info? i also read in one of the audi bulletins about a silver sticker on the radio that should make the radio reception better. is that just a plain old simple sticker with metal backing?