You're in an interesting position to discover who your local thief is, on your own, and then report them. You can do this each time you have something delivered to your front door. Two ideas: 1) whenever you expect to have something delivered to your home, leave another box at your front door that contains "GPS asset tracking" technology, so you can have any items in the "planted" box tracked using GPS, or 2) setup a mini video camera that records anyone visiting your front door.
You could also purchase "no soliciting" signs or stickers to prominently place on your property, and then let your neighbors know that if anyone other than a delivery person approaches your front door during work hours, that person may be a thief and to keep an eye on them.
The people who commit this type of crime are otherwise difficult to identify. If someone is brave enough to steal packages from your front door, then they are likely going through your mail and your neighbors' mail as well. This is the type of person the entire neighborhood should be interested in identifying.
You are not the only person who has had this problem. Two years ago someone regularly sifted through our mail and took what they found to be valuable. I knew who it was but did not know how to catch them, at the time. They have since moved.
