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Have you found any that were actually rare? If so, how much more than face value were they worth?

I haven't found any rare but actually I think that they are 'all' rare because they are hard to find. So, I always keep them and I expect they will be more valuable in the future.

I had quite a few bills on hand and I only found one, so you're right about them being rare. I hope you're right and that you can get some extra money for them someday.

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