Have somewhat of an unique situation with a lost bag.  I get that often what can happen is someone grabs the wrong back by mistake but here’s what happened to me.  I did the port valet service (bag should go from ship to port valet to the airport, I put the tag on and as I was putting my bag out of my cabin, there were porters right there so I actually saw one take it.  After I landed and saw my bag wasn’t on the baggage carousel after it stopped I checked the status online and it said “There ar