First, check around your house; look around each door, in your mailbox, on the side of the porch, between the screen and front door to make sure it was not delivered to an unusual place.
USPS is offering Informed Delivery services. There may be occasions where a mail item may be delayed in reaching its destination.
If you're still unable to locate your package, call your local Post Office and ask about the shipment, providing the tracking number that was emailed to you.
If the Post Office cannot help you locate the package, please let our support team know. You can contact us by clicking on the "submit a request" in the top right. Please include your order number in the email.