Fair enough. I live 120 metres from the number 96 tram line and I've never seen one numbered higher than 6005.
So what's happening with the other seven? Conspiracy theorists might postulate that the union may have black banned them from running until after the state election?
The VicSig rollingstock pages are informative although I'm not sure how often it is updated. According to the list, E.6006 is being used for driver training, and E.6007 is in service. I would assume the others are either at Preston, or Southbank for testing.