This depends on the situation whether the delivery requires a signature or the presence of the person. Drivers will bring packages to your door if you don't want them signed for. They'll leave the package in a safe location on your porch or doorstep. Amazon Logistics will leave a "We missed you" care and make two additional attempts in the coming days. On the third try, if they still cannot find their package then Amazon sends it back to their warehouse with an automatic refund to the customer.