Not sure how someone gets access to luggage thats in the hold of the boat. Maybe little men hid down there waiting for bags with laptops in them to be stowed away. I regularly buy stuff in Belize City and have them deliver to either the San Pedro Belize Express or the CC water Taxi and they seem to always get it too me. I've lost cell phones from my baggage checked on Mayan Airlines, but my guess is that it was a crime of opportunity, the phones were in a side pocket not in the bag itself. If you have stuff you consider valuable carry it with you, none of the items you mention weigh more than a couple of pounds.