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Also how would they have sent It to the right warehouse without the full address info
It's not the right warehouse, it's "the" warehouse.
and somehow they had your phone number
That doesn't seem that far-fetched. Half the places ask for a phone number along with your shipping information. If you try not to provide one, they say your address is incomplete.
It’s common for FedEx and UPS but not the post office as far as I know.
How much do people pay attention to that detail, though? I certainly haven't. And I at least differentiate between UPS and USPS while I know a good handful of people that don't remember which is which and don't particularly care.
Plus, if you're buying something on Amazon, you have no idea who will be shipping it when they ask for the shipping address, so pretty good chance you did give your phone number when buying the thing you're expecting from USPS.