This cover enclosing a Christmas card was mailed on December 17, 2013 to a PO box in The Dalles, OR 97058.

On Christmas morning it received a Nixie machine label, “Not deliverable as addressed”.

This cover was returned to me and arrived on December 27.

I assumed that the last name circled is not registered for that post box at the The Dalles post office, and that was the reason for its return. I was correct. The addressees have since informed me that they closed their PO box at least two years ago.

Why did it take over a week before the Nixie was applied? I don't know.  Any links to the explanation of Nixie markings appreciated.

 I ended up hand-delivering this card on January 14 2014.