I'm not exactly sure what you expect. If I remember correctly, the Ruins mod will place its stuff once a new chunk has been generated, so there's no way to predict where exactly new ruins will be generated before that happens. But when you find a map, the area around that spot will be charted (unless it has already been revealed), and if you find a big map, chances are that new chunks will be generated, and any ruins placed by the Ruins mod will be visible in map view.