Haven't read the article yet, but...
UPS guy used to just leave packages in our car (with our permission...I think...). If we weren't there, it wasn't too obvious a package was left (sorry, shoulda said...he'd leave packages in our OTHER car which we rarely drove).
Imagine if, instead of coming home to a door tag on your door saying "Oops, we missed you!", instead you got home and see an sms on your phone saying "Tag, your it! Also, your new kindle is in your trunk."
Sounds interesting.