All my Pax Britannia friends know what Boxing Day is! After performing their duties on Christmas day, the servants and laborers of the manor had December 26th off and received their presents (boxes) from the Lord and Lady of the house. This seems like a fitting day for the shepherd (laborer) to arrive with his flock, having received the message from the angles the night before.
Also, the Magi can start their trek to find the King foretold by the star in the east in earnest. “Magi” is Latin for the Greek word “magoi” which translates into English as “wise men”. This is further translated from the Persian “magu” which referred to Zoroastrians, who studied the movement of the stars to find meaning. The fields of astronomy and astrology grew from these observers. The former did not become a science until the Enlightenment divided observation from ascribing meaning. The later has become the realm of newspaper Life Style sections and roadside houses with neon signs offering Psychic Readings.
In any case, the Magi most likely came from somewhere in Persia, near present day Bagdad, in Iran. That would be a difficult desert or mountain crossing of at least a 1000 miles. Matthew’s account does not declare whether the star in the east appeared on the day of Christ’s birth, or some time before, to allow the Magi to have time to cross such a distance. Our wise-guys decided a lorry (truck to my USA readers) would be the way to start the trip.