I'd have to second the Creed Boutique.
But, my opinion (and I'd welcome others more knowledgeable) is that with some of the older Creeds that aren't selling fast, everybody's stock is going to be older. I tend to guess they make most of these scents in batches, a bit like wine.
I would wonder how fast Vetiver '48, Bois du Portugal, Royal English Leather and some of the other older Creeds sell. As such, I would guess buying from the Creed Boutique isn't going to ensure you get a BdP that was made in '10.
The newer stuff, and the scents that sell well are probably rebottled regularly. GIT, SMW, MI, OS and OV for example are probably being produced all the time to meet demand.