I’m not sure if my experience is unique, but I get so many packages from amazon so often that I don’t even bother looking too closely at the box or even have a clue which delivery might be inside. Someone could easily drop a package at my doorstep and I’ll pick it up and put it in my house without any awareness. Sometimes those packages will go for a while without being opened too, until I realize I need something I ordered. I could easily be holding a brick of cocaine for a while and not know.