Typically, it indicates that transportation to a particular site is taking a little longer due to an unanticipated logistical issue. It'll only be a day or two behind schedule but is still on its way. Keep an eye on it; if it falls behind by more than four days, something is awry. It can indicate a variety of things.
This indicates that although your shipment hasn't been properly scanned, it is still on its way to you. The location of the system is still unknown. Your parcel's status will then be immediately updated the following time it is scanned if this occurs.
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