Do you have a
DCL account hooked to your
Castaway Club #? If so, log in and go to the Castaway Club page where it shows your future cruises; the booking # should show on your future cruise list with a sailing date of 2032 or some far off year. If you do have that and don't see a booking #, it still may be possible that it was booked under the name & Castaway Club # of someone else in your cabin. But if you check that as well and don't see the booking #, I'd call DCL right away to see if they processed the on board booking because the booking # should exist somewhere by now even if the charges haven't made their way to your bank yet.