20000825 Then I don't know that there's anything you can do, unfortunately. You could certainly try contacting EA customer support and pleading your case. Since Hidden Springs can be bought with SimPoints, and (last I heard) support reps can add SimPoints to a user's account, at least in the case of duplicate purchases, it would technically be possible to grant you the points to buy HS from the Store. But in practice, I don't know that a support rep would actually be willing to do this.
I've bought the Worlds Bundle myself and know that it comes with three codes. But it's very possible that only one code shows in the purchase history, and in that case, there's likely no way to retrive the others.