If the bomber is smart, they should know, this same ploy will not work in a good portion of Austin now that the public has been put on notice. It should be the whole city will know but we know, everywhere, some people don't seem to get the news.
This could be like the Unibomber and the bomber could remain on the loose for years. Law Enforcement may well not tell the public their best clues on this. Everyone in Texas, that surrounding area, maybe the whole US, should know better than to pick up suspicious packages.