I really think it's 'un sealed' unless your crossword puzzles don't do prefixes.

A package that is 'left pawed' is somewhat damaged. A package that is unsealed is worse than one pawed. A polar bear who's unsealed is a hungry polar bear, which is worse than one who's just left pawed.

Of course I'm probably barking up the wrong iceberg. I hope to hear what the real answer is.