As I was told, the story was that he got the bass, played it for a while but then decided he wanted it fretted, so sent it back to Roscoe where it was fretted. Then he decided he didn't want it afterall.
A friend of mine who works with Jimmy told him this story recently and showed him my pictures, and Jimmy confirmed that it was in fact his bass at one point. Not sure about the details of the story, but I know it was once, at least briefly, owned by Jimmy. Pretty cool. Since there are only a handful of us lefty bassist, theres a good chance most of you own a Jimmy bass too, but I thought this was a fun enough story to share here.
Now if I could only play the darn thing...