Bring flyers to local shops. Check Via Bicycle on 9th just below South St. in case someone sold it to them. I would also check out the little shop on S. 9th that sells bikes. I think it's south of Washington Ave. on the east side of the street.
I feel your pain. A week before Christmas of '10, someone came into my house while I was home in bed watching the news and made off with my LHT that was fittedn with irreplaceable custom racks from Robert Beckman. Since the companion panniers only work with his racks, I lost the use of them, too.