Actually, I think it means they meant "Forwarding Order" so the mail would be returned with a new address, but I'm not sure it works the same way in King Co.
[ sarcasm intended ]
[ sarcasm intended ]
I believe that what you are thinking of is "Address Correction Requested", which makes it so that the post office will put forwarding information on the envelope and return it to sender. That is what they are supposed to do, actually. Instead they sent them out "Forwarding Service Requested", which forwards the ballot to the recipient without notifying the sender.