I don't know. FontBook just looks at the folder where the fonts are to generate its list, as far as I know. We're copying the files, clearly, as you can see from the drive. And the files are in the right location, and have the right content.
Perhaps your font cache is messed up? Try using one of the various maintenance utilities to clear your Font Cache -- maybe that'll help in this case. (I believe it'll recreate the cache if you boot into "Safe Boot", too.)
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--Dave Nanian
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