the box I got from OR states I pulled 1x FA mewtwo, 1x FA kyurem, 1x non FA regigigas and 1x non FA mewtwo. no shiny.
box I got from WA had 1x non FA mewtwo, 1x non FA zekrom ex and 1x shiny chandelure.
combined with that and from I hear others have pulled, it seems like you can get 2 ex's and 0-2 FA and 0-1 shiny (getting 1 shiny replaces 1 FA)