_{[In other words, this person's drawing a blank, too. His sigh carries an audible whiff of frustration.]}

I don't have anything that will help you.

_{[And the trackers he's thinking of won't do anyone any good when he doesn't think there are any here, even if they worked on Riku's darkness the same as a dark one.]}

Keep your eyes peeled, anyway. It's hard to say how long he's been missing already.