A parcel box I made so any parcels can be left somewhere safe if I'm out
Inside is a small, cheap Kmart WI-FI motion sensor that sends me a notification when parcels drop down as well as a motion sensor light that activates when the door opens.
I 3D printed the "PARCELS" label and painted the whole thing relatively neutral colours so when I move it doesn't clash with any future houses.
So far the postie seems to have been fairly impressed with it but couriers seem to just ignore it.