The message, posted in a few places throughout the sewers, prattles on about caring for various different types of flowers. It goes on for a page, and seems to have been ripped from an especially dry book on horticulture. If, though, for whatever reason you turned over the notice, you'd note a message, written in 'slightly' shakey handwriting. It's common, of course, as the man wearing a distinctive blue coat speaks and writes Ithanian like a sheep flies an airship. Poorly and often with amusing results, followed by the smell of burning wool. To the point: It details a system whereby you write a fake name on a little slip of paper, along with what you're buying or selling, and place it in the pouch, or in a little nook located under a board or behind a loose brick. Someone else then responds with a fake name, and a location where the transaction (or discussion about where the proper transaction can take place) and it goes through, (hopefully with minimal stabbings, if it can be helped.) The first is one "Blue" selling 3 dubiously acquired paintings. Of course, you might think the system is imperfect, as you could easily be caught putting in the message in the first place. But, there's business to be done.