Question about SAE rolls

How can you tell if a roll is unopened? Is there any sort of tape over the top or anything?
I heard they were making a French version of Medal of Honor. I wonder how many hotkeys it'll have for "surrender."
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You can't.
I've seen a sellers ad saying "You can tell these have never been opened by the unique popping sound when they are first opened." Well, OK if you say so.
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