How do you get the scoop A Surviving Sodier on Dark Cloud 2

On Chapter 4 or father, go in the cave on the left side of the dock, go in as far as you can go, go to your left, & from 12:00 to 4:00am, Snap like crazy at the boulder. It's a ghost photo, so you can only see it on the camera flash. I REALLY had to look for that, & I dont want anyone else to look for it as much as I did.