Bottom line.... Casky is a squatter, in the best tradition, like those in the third world of Rio De Janario and Manila.
Exactly ... he's using somebody else's property, without their permission. There's something ironic about that "NO TRESPASSING" sign ...
Also, this has the potential to be serious ... if the owner doesn't take action against him, he could eventually assert "adverse possession" against them and take the property.