Why not just have all packages go through a central location first, like an office in the city or something, where someone can open them and pass on the gifts? This is already a thing for celebrities/people who get targeted by stalkers/attackers.
Is it possible to build a "delay fuse" with a CR1216 or CR1616, Nch FET and a 6-pin AVR all inside a CR2032? Yes, with plenty of room to spare for caps[1]
Can’t realistically inspect dozen random products from Amazon each day and never let an AirTag slip. They stream from home with an iPhone for face tracking so accuracy will be nothing short of ideal.