I've seen three reasons there is only a partial list.
- The asset holder did not make a claim on glbse.com after nefario put up the claims process.
- The asset holder has received a double payment so nefario is holding that persons information hostage until the coins are returned.
- The asset holder is not on the list for some explainable reason.
I have talked with at least 10 people who have fallen in to the third bullet point there. It's not good.
I can confirm this. I have an asset with another asset issuer, I have not received any double payments and I have entered in my information. I received the 2 bitcoins I had on GLBSE before it was shut down and received those bitcoins during the first round of coins being sent out.
Just as Nefario improperly sent out double payments, it is likely he can't code correctly to see who owes what. Unless his database is still intact. Since no one but him will verify the database it is impossible to say.