I had an email from Amazon which stated the following:
Sorry we missed you. UPS SurePost tried but couldn't deliver your package today as a signature was required for delivery.
Please look for a notice of attempted delivery or contact UPS SurePost for the next steps.
The problem is, we were home all day (working outside our house) and no one attempted a delivery. I called the 800 number to UPS to get an explanation, and all they kept saying was it was delivered to the local post office. I am very unhappy at the apparent lack of honesty. I am so glad I called to complain, otherwise I wouldn't have had any idea that my package was at the post office.
UPS: Please train your drivers to actually make a true attempt at delivering packages to the address instead of getting lazy and dropping them off at the post office because they don't want to drive out of town to deliver them.