It would be easy enough for someone to steal it. There are three neighbors' doors within three paces of my door (one of them within two paces).
I'm going to put a sign up on my door that all packages must be taken to the office. It's easier and faster for it to be left on my doorstep, but not if it's going to be stolen.
Blah. Thanks for stealing my birthday present neighbor! (Or perhaps careless delivery person.)