Hello Fitz,
We;ve used to do guarantees a lot. Frequently you do find out your cabin number sooner than that.
Sometimes your docs arrive with the cabin number written right on them.. Sometimes the cabin number shows up on the first page of your on-line registration page. ( So go back and look at that, from time to time, even if you have filled everything out already. ) No telling when that might happen, but anytime after final payment is possible.And yes, sometimes not until you get to the pier.
They will still send you tags, that merely say GTY where the room # should be. (Or I believe you can print them out from your computer at home, if you get E-docs. ) Make certain the tags are filled out as far as you can, with your name and whatever other information they request. Now if you really don't know the number until you get there, what you do is this:
When you arrive at the pier and take the bags out of the taxi, Look among the baggage handlers for one with a large clipboard, or sheave of papers. They will be able to look up your name on the list and then he will mark it on the tags for you. (The baggage handlers have to be able to do this, in order to know where to deliver your bags. )
One note: one time our documents arrived a few weeks in advance, with cabin numbers on all the tags. But when we got to the desk they had upgraded our cabins to another deck. We waited quite a while for some of our bags to arrive, and when they didn't show, our son ran down to the OTHER cabin, the one we had originally been assigned to and whose number was on our tags, And there were our suitcases sitting outside that door. Just a thought, should anything similiar happen to you.