answer - he finds dogs bones

@nemesis4ever said:

question - what does robert thorn find in the tomb?

Are you asking because you have not seen the movie, or did you really miss the pivotal significance of this scene to the entire plot, including the dialog that tells exactly what they found in the grave? (here's a link to the scene - there's no ambiguity as to what happened.

@nemesis4ever said:

answer - he finds dogs bones

Apparently, you missed it, too. For a refresher, here's the scene.