You just remindede that I need a new pair of shoes. I'm looking at the Amazon order page and it says "sold by Zappos". Does Zappos use Amazon's warehouses? I

You just remindede that I need a new pair of shoes. I'm looking at the Amazon order page and it says "sold by Zappos". Does Zappos use Amazon's warehouses? If yes, is Zappos stuff co-mingled with Amazon stuff? Screenshot of the order page: https://imgur.com/UMkUoau https://imgur.com/UMkUoau