https://consumerist.com/2017/10/25/amazon-launching-service-that-lets-delivery-drivers-drop-off-packages-inside-your-home/

As it was predicted, so it has come to pass: In an effort to combat “porch pirates” who love swiping any boxes left outside, Amazon is launching a new service that allows delivery people to walk into customers’ homes to drop off packages.

Amazon Key starts Nov. 3 and is only open to Prime members. It also requires customers to first buy an Amazon Key In-Home Kit, which starts at $249.99. The kit includes the Amazon Cloud Cam (so you can watch your delivery live or in a clip later), an indoor security camera, and a compatible smart lock from either Kwikset or Yale. You can get the lock installed for free, however.