It isn't that Amazon can know that a particular person will place an order at any particular time, but they can know that a certain number of people is a particular area will be placing an order.
The packages would get shipped with a partial address, and the actual address is updated in the shipping company's records when the order is placed, while the package is in transit.
I think it's a brilliant idea for a big country like the US, where surface shipping can easily take two or three days.
Essentially they'll be using the shipping company's buildings and trucks as remote warehouses.
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