HostPuma: Thanks for your response.
I can’t imagine how the client could have done it. He never accesses through his cPanel or messes with ftp or files other than through the WP admin panel. Is there even a way to “reset” the install of WP from the admin panel?
How would I know if the site had been hacked? Can you refer me to an post, or person who could help me check that out?
Host company is not helpful and doesn’t keep any backups.
As for me doing backups – I know. Lesson learned. This is pretty painful. There was a lot of work in this site.