I’ve read that Amazon will move physical inventory closer to your location in preparation of you ordering it. If you’ve browsed the product page multiple times, added and removed it from your cart, or saved it for later, they’ll move the product to a warehouse that’s near you for when you finally submit the order. You can view the patent for this “anticipatory delivery” [here](https://pdfpiw.uspto.gov/.piw?Docid=08615473&homeurl=http%3A%2F%2Fpatft.uspto.gov%2Fnetacgi%2Fnph-Parser%3FSect1%3DPTO2%2526Sect2%3DHITOFF%2526p%3D1%2526u%3D%25252Fnetahtml%25252FPTO%25252Fsearch-bool.html)
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