Paul,
First of all, great detective work; Sherlock Holmes would be proud of you.
I like the way you are keeping everyone in suspense by giving us the whole story in stages vs. one shot via a generic: "Hey Liteweight, I've finally found the name of the owner of the Manhattan Speed Parts Dart!", or something similarly unexciting (although that in itself would be cause for great excitement).
And the plot thickens...
Pete