Universal Parcel Tracking - Instant Parcels

This status indicates the package has been delivered to the end customer. The package will have been dropped off and the tracking should note the delivery date/time.
If for any reason any package is unable to be delivered, one of the below statuses may be encountered:
Delivery Failure -This status indicates that the package was unable to be delivered for some reason (i.e.street number not found; no secure location available; no access; etc). Typically an order that fails to deliver will be returned to sender (explained below).
Return to Sender -This status indicates that USPS attempted to deliver the package to the customer but was unable to complete delivery for some reason - generally a carrier tries multiple times to deliver a package before processing a return to sender.