Thanks for your feedback and sorry to hear you experienced problems witht the late departure, this is the first time we've had issues, but it was good that I knew we should get instructions on what time we could stay in our cabin before we had to leave, where to leave any hand baggage securely and that we'd need different tags to the ones provided as normal by our stateroom attendant. Had I not known this I would have been confused.
We were on Navigator the same week as you from Rome and we had exactly the same issue with the late departure. We had also pre-booked but for two separate cabins. One cabin received an envelope, but not all the tags and wrist bands were included. The other cabin received nothing and we had to visit Guest Relations to sort the issue. Just wanted to highlight that cruisers need to keep copies of their reservation as a shore excursion to show to Guest Relations. Additionally, when the second envelope was received, the luggage labels were all different numbers so we had to visit GR again to rectify (didn't notice at first because they were the same colour but different numbers?).
We also found that there were mainly Italians on our sailing which always means a very boisterous late dinner seating. Not a problem for us as we always book early seating as we have kids. Simone, our CD, did say at our M&M not to worry about arriving at the ice shows early as the Italians (she is Italian) are always late, so no problem finding a seat!
I always keep any receipt/confirmations and summaries of anything pre-ordered so that I can show Guest Relations if necessary.
As for the boisterous late dinner seating, it wasn't only then, lunch in the WJ was amusing as was in places like the SNCF train station in Cannes, the noise was so loud I nearly got a headache! There were a couple of large extended family groups (on our deck actually) who took ages to organise themselves. Quite amusing to watch, but boy you needed ear plugs!