Clay, Go knock on the door. If it was owner occupied, which I suspect it was, that's the quickest way to make contact with an expired listing. There's NOT a "no-knock" list!
Secondly, while we're talking expireds, be careful when calling off third party lists. I use them myself, but what I do is double check the "expired" from RedX or Mapsleads.com (Keller Williams Realty service I use) as you don't want to make a big mistake by calling a listing from a fellow company Realtor, or another agent/friend and embarras yourself in the process. A good friend of mine took a property off the market recently. He had it as a "Withdrawn" which in our MLS you can call but put HIS telephone number in the "Seller's" slot and stated in the confidential remarks, "Wil be back on market in 1 month--financial issues need to be clarified" or some words to that effect. He also stated, "Please respect Seller's wishes and don't call." Now being the aggressive agent you would think, "Yeah, right, he's lost the listing and is trying to get all of us to NOT call". If you use the third party aggregators of Expireds/Withdrawns you dont' get the confidential remarks. So a bunch of agents started calling "HIS" number and some of the stuff they were saying boarded on unethical as per our Realtor Code. He pretty much let the Agents "hang" themselves as they got more and more desperate and aggressive and disparaging of him. He finally let the calls ring through to voice mail and most of the agents STILL didn't "listen" or get it!! So be careful. But keep calling them! They all need the help of an ethical, caring, honest Realtor in this marketplace.