From the conditional approval letter which I received a few years ago:
Originally Posted by Global Entry Enrollment Center
[Y]ou must bring with you the following original documents to the enrollment center:
- This Letter inviting you to an interview;
- A valid passport or permanent resident card. If you travel using more than one passport, please bring them to the interview so that the information can be added to your file. This provides you with the ability to use either passport at the Global Entry kiosk;
- Documents providing evidence of residency. Examples are a drivers license (if the address is current),mortgage statement, rental payment statement, utility bill, etc.
- If you are a UK citizen and applied for Global Entry, and you are not a U.S. lawful permanent resident (green card holder) you must bring an original copy of your ACRO Disclosure Certificate (police certificate) to the interview.
To the best of my recollection, the only thing that the interviewer did with the conditional approval letter was to circle the Known Traveler Number.