How it went from her possession to Clark's & Sarah's (or what happened to it after that) for the whole season three finale was never explained clearly. My guess is that Zara and Ching know some things that Clark doesn't about their powers.
Unknown powers - now that's an interesting line to take.
In my fic, Connections, I just assumed that Zara and Ching faked the ship - that they conned Clark essentially.
c.
