Not correct....it is SUPPOSED to be scanned at the post office and every sorting facility that it goes through.
However, (and trust me, I have mailed/received enough cues to know), the post office is the WORST about actually scanning items. It is not at all uncommon for the item to only show "Accepted" at the local post office, and not be up-dated until after actual delivery.
The post office can, however, track an item with the delivery confirmation/tracking number if you call them, but they normally won't do it until after 14 days have passed. Call 1-800-ask-usps and see if they will give you any info on it, but they probably won't yet.
On the good side, I have never had a package lost by USPS...I have had 3 totally destroyed, however, and collecting on the insurance is entirely another matter.
Joe