This could be one of a few things! If it's the same day or within a few days of us prepping your order to ship, then it could be that your package hasn't been dropped yet or at the post or picked up from our studio. (Or hasn't been scanned by the pickup drivers) If this had a preorder in it, we often prep shipments a few days before receiving the piece from our factory in order to make shipping streamlined and ready to go out.  We have had dozens of customers receive their packages while still showing in the 'pre-shipment' phase of the USPS website. It can also take the post office time to update their site, which is annoying but happens.  We are always available to help explain what's going on, even if we aren't USPS or UPS. So, message us if you're worried!