you didn't buy from Amazon directly but from Amazon Marketplace which is a different animal.
You bought from one of a group of small merchants that are advertising in Amazon, bill through Amazon, but ship from their own shops/homes.
The shipping times Amazon provides are conveniently "padded" to cover for the small merchant eventual delay.
On the other hand note that everytime I bought from Amazon Marketplace (usually used books) I got excellent product, service, and delivery time was about a week. (Ground)
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