Happened to me about 10 yrs. ago. Smart-a** driver even smirked at me when I went to complain at my local PO. The supervisor said he couldn't do anything without proof. Even though the packages in question showed tracking as " out for delivery." I went to the Postal Inspectors and told them I suspected the driver was stealing the packages. ( they can't do anything unless you complain about theft, not missing or lost ) They took down my info and said they would look into it. I thought, " yea sure you will."
Several months later a new driver shows up and I asked him where the regular driver was and he tells me the guy got fired for stealing.
I didn't get my packages but that guy got what he deserved.