Dispensas de Matrimonio

I noticed some of the Dispensas don't have the little magnifying glass to search for names. Does that mean that those catalogs have not been integrated into the search feature and therefore won't show up as potential information. I've been going through each one year by year, page by page trying to find more information about my ancestors. Am I missing something or is this what I need to do. I couldn't find a marriage certificate for one of my ancestors so I'm hoping to find the Dispensa, it may be a long shot, but I need to try. I've exhausted just about every clue via "testigos, pardrinos, abuelos. Just want to make sure I'm not missing something. Thanks.