Anyone else having issues with USPS Delivery Confirmation?

[Doug]

I sent a card out Priority Mail w/ delivery confirmation Saturday morning. Everything was running smoothly until last night when I checked the tracking # to see if the package was delivered and this is what I get:

Out for delivery August 02, 2010, 9:42 AM only to be followed by Delivery status not updated as of August 02, 11:42 PM

So basically it seems like the card went out to be delivered and disappeared off the face of the earth. I called my local post office to see if they could provide any info and all I got was "Call the post office it was sent to and see if they have it". The only problem with that is when I did a post office location search on the USPS website there are three Post Offices with the same zip code so I have no idea which one it went to. I emailed the buyer to see if he received it and I haven't heard back yet, but if not I'm not sure what I'm supposed to do.