Further research maybe found a solution.
A message came into Vega that research elsewhere shows courier starships wind up in the small 3-D version of a hypercube… and the larger starships wind up outside that smaller of the 2 cubes.
A researcher in the Vega planetary system pointed out that a hypercube is not stationary. So they disregarded the earlier message. There was no name, nor return address on the message anyway.
In later years, a small odd-looking return address was found in the lower left corner of the envelope.
