In this case, I believe that the thief earned his ownership of these pieces.

But no, I think it is the same as it is with ships at home. Once one is decommissioned, parts of it may be used on a newer model, and that model may be given the name of the original ship, but it is never the same as the original ship. It is always designated with a letter. Perhaps the thief has the original and Theseus has the A model.

Not that it matters. What is Memorex? Slang?