Occasionally couriers will place packages near the area noted on your tracking, usually because the package is too large for your mailbox, protect the package from poor weather, or just out of sight for safety concerns.
If you haven't already, please check the area surrounding the noted delivery location (near the mailbox, on a porch just out of view, inside an open garage, any area out of potential weather hazards, exterior doors other than your main entrance, etc.) and with others in your house who may have retrieved the delivery.
In rare cases, packages are delivered separately from regular mail, taking up to an additional 24 hours to be delivered than noted. If it's been greater than 24 hours since your order has been marked delivered and you haven't located it, please let us know.