Yeah, clearly reading the characters (if that's what they are) is more than a matter of having keen eyesight. If they're overlaying each other, even super-keen eyesight isn't enough. I'm sort of hoping that some magical method may be able to extract what they say, as long as someone knows what to look for. If Patchouli is still inaccessible and/or busy working on this incident from another angle, I think we should at least relate this to Byakuren. If she doesn't know a method that could scry this, she may know how plausible the existence of one is, at least.
Also, while we're here, we may want to get Nazrin to try that dowsing strategy I mentioned at the Circle meeting, assuming she actually knows of something at Eientei distinct enough to dowse for.