The Stella is a marvel of engineering and criminal ingenuity. The vessel is unique in its modularity. Every component works in concert with its siblings, but is also completely self-sufficient, allowing a savvy engineer to swap out and upgrade those parts with ease. This means that the ship can very easily be broken down into its base components and reassembled again.
Harry Mudd has taken advantage of this particular element of the ship’s design, breaking it down to avoid detection whenever he pulls off a heist, only to reassemble it with different signatures in another part of the galaxy. With this ingenious method, Mudd has achieved the dream of every criminal in the galaxy. He has rendered himself untraceable.