Saks (at least the stores by me) and Saks online are pretty careless with inventory control. I have gotten Pradas without the authentication card in them from Saks, bags without the dust covers, etc., so don't feel bad. Like jm said, the cards are really worthless and the info given is not that helpful. If you want one, just call and they should ship it out.
If there is something else about the bag that worries you, post pics in the authenticate this thread.