Quite often, there are a few small packages, all kept together with rubber bands when he sorts things for delivery ..and no, most times he doesn't fish out the China one to get a signature. So, I voted 'no' although it's not always.
I don't know how such things fit into statistical databases accessible by customs & excise - if they don't get signed for, are they slipping under the radar, and therefore to our advantage in the long run?