I just had to sign up and post a big "Thank you" here!
We bought a 2007 Expedition EL Limited a little over a year ago and it had no "glove box goodies". No manuals, no key code card, and only 2 keys (no fobs).
I've been searching through a lot of wires under the dash with no luck. However, I ran across Viperinu2's post with pics and found our code! The location of the SJB is the same as pictured on ours, however the label was different and the 5-digit code was pretty well smack in the middle with barcodes above and below it.