This is a cool idea, though it requires a little luck to work. The gist is that you upload a picture to the site, it examines the EXIF data and looks for the serial number, then checks the web for photos with an identical SN. If your camera is lost or stolen, there’s a chance it could pick up pictures taken by the new owner, if they haven’t scrubbed the metadata.
Give it a shot. It didn’t work for me, but the photo I used has been through several editing apps.