Off the topic and maybe against you ethical standards, but why return? It's marked "lost" already..
Give it away in a other "free N810" contest or pass it around in the dev community who needs to testing on N810 ....

More on topic, I don't understand why UPS (or other delivery stuff) don't record the GPS position of delivery...
Not really of direct use, but once there is a issue, they can simply check if the coordinates are correct with your adress...