FBI and other US officials like the 'Operation 4:00AM knock on the door' better. at 6:00AM, some people are actually you know, already awake to start their day. Much less likely at 4:00AM; Path of least resistance.
Depending on the vendor you get the box from though, you might have to tape it up yourself to make it useable. Now, the only question is do we start calling these Universal Box Accommodations DEB hotels, or RPM hotels?