Theives are often mistaken for raiders but this is not true although the diffrences are lacking. Theives wont destroy your base but will wait until your gone and will run into your base and steal small things such as Plastic, Wood, Metal, Brick, Sand, Seeds, and Food. Although these players are not danerous they often use these new resources to create things like Oil Drums, Guns and Tools that will make them Raiders. Theives may just steal small things so that they can get by.