I am another of those who purchased one of these from here via Alex (I do thank you for the quick service). Now that this info has come to peoples attention regarding the serial number and update issues, I probably would have held back buying one if I knew so before hand. I assumed they were full retail units from the factory, minus the box. I assumed this as this is whats usually happened when I have bought 'direct from factory' in the past.
I am in the same boat. I would have just purchased from eBay or a friend in Japan if I had known as well even at the higher cost.
The new version is not a new version of Android. I'm going to pick up an official retail boxed F807 online and compare the two, though.