If you still have the originals (pdf,rtf,txt), try importing them into Calibre. Calibre might do a better job of auto-detecting the author and title than MobiPocket Reader. Also, if you used a systematic file naming scheme Calibre can use this to set the title and author. See Preferences -> Adding books.
Finally, I find it useful to "fetch metadata from server". It can be time consuming, but typically all you need is one identifying feature. The advantage is that you get more complete info that way.
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