Redundancy. The others might have been lost (check point, informal toll booth during a bug out, floating down river with someone unfriendly <img src="/images/graemlins/grin.gif" alt="" /> ). Besides, an Xacto blade really doesn't take up space.
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-IronRaven

When a man dare not speak without malice for fear of giving insult, that is when truth starts to die. Truth is the truest freedom.