[gambiting]

Over here I was definitely told by Amazon drivers that unless they type in the code it won't mark the parcel as delivered. The same with GPS trace - unless they are within ~100m of the destination it won't let them actually mark it as delivered. Maybe your driver didn't care about having missing parcels at the end of the day, but the system is strict about it(again, over here, maybe Amazon US is different).

[joezydeco]

It must be, because I got the "delivered" message and found it sitting outside our door on the floor.