Only a wuss makes excuses for not delivering the packages in their truck "because it's dark, and it's late, and my boss is mean." If you are not out of hours, then finish your damn job like a man and be done with it. Ring the doorbell as a courtesy to the customer, so their package isn't left on the porch all night where it can be stolen. If they get their ass in a bind, they can complain to the 800#. It's just a little darkness. Get over the excuses and get the
done. Work now, grieve after. Sheesh.