No undelete that I am aware of. You can try some 3rd party options if you feel like it.
Anyhow, to see files on the MBL HD, follow this guide… pay attention as it has the link to file recovery at the top, but again this is recovery, not undelete…
http://community.wd.com/t5/My-Book-Live/GUIDE-Debrick-MyBookLive-v2-0/m-p/567582
