In short this is what goes on:-
1. Queue outside (near the escalator above GSC Cinema / RedBox Gardens) - there is a person next to a number ticketing machine.
They will check whether you have the confirmation ID & cross ref with your IC. I assume if your name doesn't fit - you might not get in. (I am not confirmed - just assuming!)
2. After checking, you need to fill in a "iPhone 4 Collection Checklist". Someone does it for you. They ask what is your mobile no, name, ic, what plan, 16 or 32GB phone, do you have ic (if not you can use Credit card, driver's license).
3. When you are called in, you go into a small area between the outside and ballroom. I assume only 60 ppl are called in each time.
4. Guess you have to wait to be called into the main ballroom. I can't tell you cos I was the first batch and hardly any waiting. There are 60 counters and they are very friendly and helpful. I think you want to speed up the process - photocopy your ic and make sure you have your confirmation ID and checklist and number in hand or at least ready.
I asked the guy serving me -
authorization letter is not accepted unless owner is present because the owner needs to sign contract! This is what the guy who served me said. Please be warned - I am telling what i know.

I assume average half an hr per customer if no hiccups. He/She needs to enter details, go thru the plan once again, swipe CC and check your phone - then out you go!
Thanks, Bontaku.