I don't think they will ever have the postman do a CD, they are not even law enforcement. Sometimes it is LE disguised as a postman. Sometimes they pretend to be a neighbor and say it was delivered to them, then ask if it is yours. Sometimes they do covert surveillance on you, wait for you to get the pack, and then raid you half an hour later. Sometimes they pull you over the next day when you are leaving your house (only heard of this happening once). I have also heard of several cases where they don't do a CD and your pack just doesn't show up, then eventually you get a knock on your door and postal inspectors interrogate you. Sometimes your pack doesn't show up and one day you wake up with your door on the floor and a gun in your face. I am not sure how they decide to go about it, but they have several techniques. I would think they would always try to get you to sign for it, but this is not always the case. One person I know in Australia never even saw the package until he was in court, he got an early morning raid while he was still waiting for it to be delivered.