Trivia: In Dryden Vos' meeting room, the golden idol from the opening scene of "Raiders of the Lost Ark" can be seen briefly on one of the tables. So too is Mandalorian body armour, similar to Boba Fett's.
Trivia: Warwick Davis plays one of the marauders. He also played Wicket the Ewok in Return of the Jedi.
Answer: Or they could've hitched a ride with the Cloud Riders.