I would not be surprised to eventually learn that our sniper is leaving a note everywhere now. We wouldn't have learned about this one, except for the fact that Moose needed to communicate to the sniper about it.
I think there's far more going on than we realize.
Maybe we only know about the Tarot card because it was leaked. They did get ticked about that news getting out. Maybe they've been more careful about other clues getting out to the public at large.
Which I guess is ok in order to preserve the investigation. But I'm not so sure these days that news is being suppressed for the right reasons.