Hi all, sorry for reviving this old thread but I think Supamax and the contributors on this thread made a wonderful job in trying to find checksums from the original and unaltered Workbench and related disks. I've started a new thread over at the Tosec section of the site here
http://eab.abime.net/showthread.php?t=82731 and tried to summarize all the data gathered in this little page :
http://amiga.workbench.free.fr
So feel free to submit your findings on the dedicated thread and let's find out these missing long lost workbenchs CRCs