Facebook Comments migration / transfer

Hello I’m trying to launch my clients website today and they are using facebook comments instead of wordpress comments. I’m not familiar with facebook comments but thought that they would be stored on facebooks servers and be synced to the blog url structures.

I created a new database and instance of their blog so that should something happens it’s as simple as switching names on their settings and the old blog pops right back up. They simple have it stored as the folder /blog/ under their domain so there’s no special domain mapping and all that. Just change the folder name to /blog.old/ and put the new folder as /blog/ and the switch happens easily. With the new duplicated blog and new database as well.

PROBLEM: Facbook comments are NOT showing up in the new blog. Even when the blog URL’s have not changed one iota.

How can I fix this so that they will show. I don’t understand what has gone wrong and how to get the comments to show on the new blog that shares the same URL structure.