There's a spot on
http://quilterscache.com/ to list missing quilts.
You might also use Craigslist in your area. Also if your local paper has a section for lost/missing things......
If someone local took it and sees such a posting, they might be convicted of their devious actions and return it.
Also contact your area quilt guilds with a heads up in case it were to show up for presentation in one of their shows. And, tell your insurance adjuster.
Do you Facebook -- also a good place for posting.
Jan in VA