Case was actually transferred to the local office, not the 'National Benefits Center'. I think the NBC process did not exist in 2005. Was sworn in and told that if the interview identified any missing evidence needed to approve my case, the officer would give me a letter and 30 days to produce the evidence. Was asked to show various documents--eg passport, driver's licence, EAD. Officer made photocopies. Was asked why some documents show Australian citizenship and some show Canadian citizenship. Explained I am a dual citizen of Australia and Canada and have not lived in Australia since childhood, but was using the Australian passport for the GC process as it is good for 10 years. Offered to show proof of Canadian citizenship but officer was not interested. Was asked whether I was working. I was self employed with my own corporation which I explained was legal as I had EAD and this was a self-sponsored EB1-EA case. Provided letter stating this as well as a copy of a recent large check from a client as proof of income. This seemed to satisfy the officer. Was asked whether I had ever been in court over a traffic violation. I explained I went to court over an allegedly running a red light but the judge dismissed the ticket. Was asked whether I did in fact run the red light. This was tricky because the original ticket was dismissed on a technicality without my having to testify, whereas I was now under oath at the GC interview. Replied that to the best of my knowledge I did not run the red light, but admitted my memory could be hazy--but reiterated that the judge dismissed the ticket. This seemed to satisfy the immigration officer. Was asked when my most recent entry to the US was. Replied that I had been paroled with AP a few months earlier and the officer made some notes to update my records. Was asked whether I had applied I-485 before the expiration of my last H-1B and I said that I had. Was asked whether I'd been filing tax returns. Replied that I had as the officer thumbed through the tax returns in my file. This was a tricky moment as the tax return he was looking at was at the time under audit by the IRS (subsequently resolved). However he did not pursue the question of my tax status further and said he was ready to approve my case. He explained he would stamp my passport with a 1-year I-551 stamp but would keep my last I-94 and EAD as I no longer needed them. He took me for an index finger print and signature on a signature card. Escorted me back to the waiting room and asked me to wait a few minutes for passport stamping. He returned the passport with the I-551 stamp about 10 minutes later. Told me to expect the plastic card in about 1 month but to wait 6 months before inquiring if it took longer. He shook my hand, congratulated me, and wished me a safe trip home.