Concerned on D800 purchase

Hi all, I'll be purchasing the D800 in the US but I'll be staying for a few days and won't have time to return it for an exchange. Given the numerous reviewers in various forums reporting the AF issue, and following Hogan's recommendation:

"If you buy a new D800, look for any evidence the box has been opened and the camera been used in any way (i.e. might be a returned unit). If you don't get the prompt for setting the date and time, for example, there's a chance that the camera has been returned and you need to ask some tough questions of your source."

What is the most reliable online store to purchase the D800 and not end up purchasing a returned unit? Amazon, B&H, Adorama...? Thanks.