All of my files are missing

I have been a Box user for years. I use it for personal files (family photos) and for work (folders shared with me by others).  As of this evening, everything is missing -- my account shows 0B of 10GB Used.  Yet there is no logged activity.  There are no files or folders in the Trash.  No shared folders have been unshared with me (I have checked with the owners).  The account is associated with a personal email address and there are no notifications of access or changes. Resetting a password and logging in using different browsers had no effect.   

I have already evaluated the standard responses for how to troubleshoot.  This does not seem to be a standard issue -- my account has been completely and suddenly wiped.  I would appreciate help.