9-436: Pristine, Downport Administration

Those are possibilities, though Message Ships are not built for atmospheric flight or surface landing so he couldn’t have boarded one at Pristine Downport because they can’t land there.  He would have had to make his way to the Highport via another means, but that would apply to most FTL carriers… 

But yes, assuming that is Argyle in the image, the clothes he is wearing are suitable for various snuckings.