I think i´ve experianced something like this last year when returning from norway,
I was outside, With my Wife to smoke a Sigarette, There was a Spambot Sitting against the wall, On a blanket, reading a book and drinking a bottle of wine, Then a few hours later, She was still there, Came back, Still there, Then we went for another Sigarette and the lady had vanised, leaving her stuff, A crewmember talking urgently and concerned over the radio, Then a few hours later i went there to look, And the stuff was still there.
The following morning we had arrived in Kiel at the Norwegenkai, And trough the ship´s speakers they couldnt find the owner of a car Anywhere onboard the ship.