Ive been home, hear the FedEx truck from the kitchen window, my dogs start to bark because someone is approaching the house. I run to the front door and he was driving away and around the corner already having left a "sorry we missed you" tag on my screen door. I was so mad. I WAS HOME. he didn't even try to attempt to deliver my package. No knock, nothing.
But back to the topic... it was probably stolen from your porch. What's your neighborhood like? is your front door close to the street? Can a package be seen easily from the street? This always used to freak me out. I put big planter pots with a rose bush on my porch the driver can hide packages like phones behind. My current house has a flight of stairs and a long path and a covered garden area you have to go through to get to my front door. The mailman hates me. But this is where I'll probably get the Joe Montana treatment from FedEx/UPS