My post office said that when mail goes to the larger sorting hubs, they sometimes have canines that act a sniffer dogs. I asked what are they looking for? His reply, they can smell gun powder, sulfur used in matches, drugs, and even certain kinds of plants that people mail to themselves from foreign countries -- not to mention drugs. He said when shipping a package, you have to sign by using a "yes" or "no" electronic kiosk button that you certify there are no hazardous material, anything sharp or potentially dangerous. That's where it comes back to haunt you -- the penalty for perjury on a federal form is much greater than that for concealing a few books of matches. He says, everything is so computerized, they can trace any mailing as far as each large envelop first-class package rides a belt through a large scanner that makes a photo record. My reply to that was, "that's pretty sophisticated, and I bet you never loose a package!" And, if you are charged under the statues, you will now have federal record -- which he said -- could possibly ban you from flying on a commercial airliner -- "no-fly" list. That would be a severe penalty for a "give-away" matchbook. But, stranger things are happening in this country than has never been seen before. Good luck with your decision to "ship or not-ship..