Keyless entry code location?

A ford dealer can pull the code using Ford's scantool, there was an id card with the factory keyless entry code on it in the glovebox originally, usually it's also printed on the bcm.

it is eather on the rear hatch arm eather side is on a small white sticker,or under the carpet under break peddle on a gray box.

what is bcm

i have 2003 sports trac some say its behind back seat pull plastic cover off by seat and box is there with code not! some say temove defrost cover in front than go out and look through window see white box with code not ! will the real truth come out please tys