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For eBooks downloaded from any book collection, or bought from an eBook store, the metadata will, generally speaking, already be present in the book. If the book has no metadata, the Opus will, in that circumstance, display its filename.
When you "add" metadata using the Windows Mobi Reader, you are not adding it to the book itself - it's simply stored locally in a separate file which Mobi Reader displays. There are many tools - eg the free "mobi2mobi" tool that you can download here from MR - which will genuinely edit (or add) metadata to a Mobipocket book. But, as I say, any "real" eBook will have metadata already.
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