I think I have a sequence mate of the cel you lost and I 
would be frantic if anything happened to it.  Did you try 
getting ahold of Tokyo pop?  When you work a table at 
a con people leave stuff all the time.  Most times you 
stash it under the table and wait for people to come 
back, it's all you really can do.     Good luck on the 
quest.   (fingers crossed for you)