How to use "sealed" in a sentence

The coffin was sealed when it arrived, and we didn't open it."

His ships, sealed in their glass worlds, relaxed him; he liked to spend time with them when he had a problem to work out or when he was on edge, for they made him feel serene, and that security allowed his mind to function at peak performance.

So if they can't open the grave and see for themselves what we've done to Danny Evans, what are they going to do instead? They're going to do the next best thing - talk to the person who was supposedly the last one to see the boy's corpse before it was sealed in the coffin