User blog comment:IamJakuhoRaikoben/Chapter 441: Caracole Island, Review./@comment-24102956-20150623041623/@comment-24546844-20150623212413

They did know that they were from Ishgar though. If the informaation leaks and at least one of the guard moemorize their faces or magic then it would be enough for their identities to be uncovered, if Alvarez at least make some eforth to know the enemies.

We can't forget that all of them but Mest were on big lachrima screens during the GMG and if Alvarez is looking for strong mages to be aware of, that would be the right place to start the research.