In Sweden we have protection from many things but the problem is that the government tells you that you can't build anything, can't change anything and as a byproduct effectively made the area worthless.

So I know people who have found things that are archeologically important and they dig it up, drive to a forest and throw it away. About two years ago a neighbor of a person at work found a big intact sword and they asked guy at work that is into history of that area. He was then consulted in secrete because they didn't dare go to the government for losing land valued at 200 000+ USD. The sword was very likely real and should have been displayed in a museum.

So unless the government start paying real market prices for the area they create special status for, then many people will not report and instead hide it. Anytime the government here take some special are such as woods and give "fair" compensation, people are never happy because the government gives you X and you have no choice.