Amazon software will predict when a customer will order an item, then push it through Amazon's shipping process. Packed orders would wait at shipping hubs until a customer's order arrives.
At this point, it can be dispatched to the customer's address far more quickly. It's a system aptly called "anticipatory shipping."
Keep in mind this is just a patent and Amazon hasn't announced any plans to implement such a service. But it does give us a hint at Amazon's thinking when it comes to getting stuff to you faster.
The 27-page patent is loaded with technical details that you can peruse at your convenience here.

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