When we were at Saba last year we had the BVI authorities (I don't recall what department anymore) come along side and ask for our papers. We had two guests that joined us late and were leaving early so they spent some time looking over our papers to make sure they were in order. So enforcement can happen anywhere - make sure you have the papers in order. I imagine with the new push for more revenue they will be happy to give you a great big fine for an oversight/mistake.