From the TestDisk search option, under "/DCIM/Camera" directory, there are no sign of deleted files (Note: Deleted files will be displayed in red text)!!!. OMG!
No success from web search. There are many others whom faced similar problem, read https://www.google.com.sg/search?q=n...hoto+disappear.
Note: I am no beginner and have some knowledge on data recovery.