Sorry to hear about that.
Unfortunately, from what I was told several years ago from a long-time dealer that this is an on-going problem at the Chicago shows. He's been ripped-off several times there in the past 8 years and so have many others at that venue as well as others in that region.
I commented on this on the CU Board with the user name "dude" several years ago:
http://forums.collectors.com/message...hreadid=589377