Gary, Badger, your window sticker would actually have it listed under Optional Equipment if it were a Job 2 or 3. Job 2's would say "JOB #2 - ORDER 7/31/06" while Job 3's say "JOB #3 - ORDER 12/04/06".
The VIN number is also somewhat of an indicator as STs with a VIN ending with a consecutive build number of around 31000 or lower were Job 1's.
Not sure where the Job 3 VINs come in but I'm guessing somewhere around 60000?
The power down rear window became an option prior to Job 2 so that is not a good indicator but the cup in the front door arm rests was part of the Job 2 changes.
Don't have a clue what is different about a Job 3 but I suspect it is mostly computer programming related.