I read some where that the inspectors on the assemble line would sign the firewall. Can't seem to find now where I read that. Would this be the case on mine or some PO's way of personalization? My truck was built in Oakland California. Has anyone seen this?

http://inlinethumb34.webshots.com/609/2107832160103997649S600x600Q85.jpg
http://inlinethumb14.webshots.com/26957/2416431860103997649S600x600Q85.jpg