I'm puzzled by the early-morning delivery. If it's being sent through ordinary delivery means, such as a post office, do they ordinarily deliver at 4 AM? If i

I'm puzzled by the early-morning delivery. If it's being sent through ordinary delivery means, such as a post office, do they ordinarily deliver at 4 AM? If it's being sent through some drug-dealer courier system, is it necessary to go through the charade of dropping it off at a customer's house?