If set as ‘Yes’ you would need to find all of the greens in the deck for the lock to end. Any extra greens added by a keyholder during the lock will have to be found too.
If set as ‘No’ then only one green card would need to be found. Any extra greens in the deck increase the chance of finding just one of them making it easier to end the lock early.
Any greens found go back into the deck if a reset card is revealed, or the keyholder resets the lock.