Amazon delivery driver. Please answer

Yep, this is Amazon delivery. I wasn't expecting them to come on a Sunday, so I ignored the knocking at my door while I was doing some work on my computer. Then I got a phone call from Seattle and thought--this couldn't be a coincidence--did a quick Internet search and found out it's Amazon, so I caught the guy as he was writing a note on my door that he was leaving a package!

Don't block. It's your Amazon Prime Now delivery person trying to get hold of you.

I THOUGHT THAT AMAZON DELIVER THOUGH THE MAIL OR UPS SO WHAT AM I MISSING

Some cities have an option for 1 to 2 hour delivery.  It is called Amazon Prime Now.  It is included in Prime membership, but it is delivered by a courier.  There is a recommended tip given at checkout, because these people pay their own gas and use their own cars while not making more than your average job.  It is basically a service available to certain Amazon customers.  Usually it means you have a distribution center in your area.