I think that's exactly what it is but could that possibly be the actual place they found her? I wonder if anything in the article clarifies that.
No that's not where she was found. It's just a hole in the ground and some plywood sheets with a superimposed (reversed) photo of her from NYC.
Odd composition.
If you look at the video of the guys looking around the area by walking along the railroad tracks, you can see there is nothing that looks like that.