I had to ring SQ and the sent me through a copy of the itinerary. It wasn't the actual booking and doesn't have the e-ticket number on it, but it does the have booking reference on it and I am able to log onto the SQ website using this and can see my booking and e-ticket number etc.
Very strange that the itinerary that you received doesn't have the booking reference on it. I'd be giving SQ a call.