Carriers sometimes mark packages as delivered when the package is handed from one carrier to the next. It shouldn't happen, but it does (occasionally).
If you got a notification of delivery but you cannot find your order, we suggest waiting a day or two to see if the carrier ends up delivering it. Then if not, we suggest reaching out to the carrier for more information.
Of course you can also check with your neighbors to see if it was delivered to the wrong person a few doors away.
If none of these options provide answers, please reach out to us and we will do our best to track it down on our end.