That is a question that has never been provably answered. I don't think there are very many people that believe they ever had any reasonably sized data center if any at all. J. Mordica's video proved nothing more than 2 small rows of miners somewhere.

EDIT: I have always been under the impression that it was something along the lines of what Bitpop said. Somehow they visited a warehouse and had pictures taken. Whether they paid someone off or not remains to be seen. The picture could also have been photoshopped as some have suggested but I think that to be less likely.