First time I've heard about the antique dish and him carrying it in his briefcase. I'd wonder about that... Where did this info come from??
Anyone who moves around like he does learns to carry their wallet, an extra car key, cash in more than one place on his person etc, etc...
We can speculate till we're blue in the face. The only way this is going to get solved is if they let all the info out...and that's not going to happen...because there are three street people...the two cabbies, the dumpster driver...and they'll all cover each others butts. A good example is "I don't know how my name got on his cell phone".
The antiques dish info came from the Examiner timeline link I posted earlier this morning.
Also, it was noted that the police identified him soon after finding his body, so he had to have something else on him for identification. I think even fingerprints would take a while.