Some sets still don't have an index, although people are fabulous at chipping in to help out with the project.One way of viewing all the sets that do is to look at the member gallery for galleryindex, see
HERE.
But in general you can take it that if there isn't one stickied as the first upload when you view a set gallery, we still don't have one for that set.Except - you can find the more recent uploads which still haven't been processed in this gallery here:
Index Cards Gallery at Splitcoaststampers