Originally Posted by fixedpip

They need the serial number of your key. It used to be stamped on the key and now its on a little metal tag attached to the ring that had all the keys on.

I really preferred the old style while the # was etched on the keys. Now its a lot easier to mislay that little metal keyfob thing.

That way should you lose a key, you can order a new one from them. They're pretty responsive.