I don't think you need the packaging since Sandisk offer a "LIFETIME GUARANTEE", or at least they did with both 1GB cards I have. As long as it's branded I think they will fix or rather replace it. Goto the website and contact them to find out.
Let us know what happens.
EDIT - I missed that you formatted it and fixed it already, cool. I think I wilkl back up my important save games every now and then to make sure this does not happen to me. Hate to loose my save on Zelda : Link to the past.
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