In that case, maybe try sending Garry from Nizzbits on this forum a pm. I'm not sure if he's still around, but he used to help out with genuine Nissan parts on this forum. Worth a shot I guess...
Strange. I rang Rockingham Nissan when I needed to get the code for my d40. I had the deck out so took a photo of the sticker with serial number on it. Spoke to them first and emailed photo thru. Had the pin within the hour.