The movie was a bit of a culture shock for me. In Denmark we have similar mounds to the one being dug in the movie. They're often left untouched as a form for respect to the dead. Whether it's a recent law I don't know - but archeological finds in Denmark belong to the state. Always. It's actually illegal to not report findings to a museum because it's a national treasure, you *technically* don't own it, even if it's on your land.
I enjoy the movie, I thought the storytelling was great. The fact that it was based on real events made it even greater. I'm digging it!