autosave drawing

Does anyone know how to recover an automatic save of a drawing?  DS just crashed on me before I had a chance to do a manual save.

If you go into Options/AutoSave & Backup it shows a location for such files.  You can even open the folder from there.  Sure enough, a drawing does seem to have been saved with a similar name to the one I was working on but it is greyed out and apparently unavailable.  If you try searching for the file or folder using Mac's Finder, nothing appears.

It looks as if the Beta version is saving something deep in the bowels of the software package but doesn't actually allow you access to it.

Or perhaps I am doing something wrong?