What does Mercer Island do with seized property?

When the owner of a stolen or found item can't be located, the Mercer Island police department sells it at http://www.propertyroom.com

You can also register your items at http://www.stealitback.com. If they are ever found by the police, you'll get them back for free.

Apparently Mercer Island was the first in Washington State to join this service.