I accept I may have been looking in the wrong spot, so if somebody could clarify this that would be great

I'm sure I'd found the right '6ft triangle shaped rock which is actually a diamond' and, if so, then the box should have been situated amongst the large rocks four paces away.
I have taken pictures and will happily email them to anybody who might be able to help. Their file sizes are too large to upload to this post.
Any help would be greatly appreciated as I am trying to complete The Tops of Dartmoor series.
Many thanks!
Rat King