Wow, that’s really taking it seriously! I can’t wait to see the result of this.
About 17 years ago I put a sensor in my letterbox so it would send me notifications as text messages (using a hacked Nokia mobile phone controlled by Gnokii software and a serial connection) but I didn’t try to put any physical security in place. I just wanted to know when the mail had arrived.
I’ve been planning to do an episode about it, because I’ve since replaced the front gate and letterbox, so I need to install a new notification system. I also backed the Package Guard project on Kickstarter way back in 2016, but that seems to have gone off the rails so I was thinking about making my own. Deliveries are made to our front door in a spot that’s out of sight from the street, and I have a camera pointing straight at the front door with motion detection enabled, so I’d know if anyone stole a package. My plan is just to put a pressure-sensitive mat beside the door with a sign that says “place packages here”. When something is put on it, I’m notified. If the object is later removed without me disarming it, an alarm goes off. Just like Package Guard, basically.