> The safe in our room on the Pride specifically stated on the
> front "Do Not Use The Blue Sail and Sign Card." For what
> reason I do not know.
On most of the Carnival ships, your Sail & Sign card also acts as your room key.
If you've used it for the safe (which u can) and lose it, it's conceivable someone can get to your cabin, and into your safe, before you notice it missing, and report it.