All of the Brinks boxes that I get are taped closed. I think they come that way from the tellers that package them at Brinks. Good thing about Brinks boxes, although they don't always produce, is that you can search the whole box in like four minutes because of the clear plastic tubes. On Brinks boxes, try to notice the teller stamp across the top. The stamps are usually just names like: "Alice" or "Dudley" with a date. I have noticed that if you find an "Alice" box, it will produce better results. "Dudley" boxes usually do end up in fact being duds, but they will still have a silver dime every once in a while. :-) My Brinks box average on dimes is probably around .90 dimes per box. I like going through dimes as it was the first silver denomination I started hunting.