How to verify correctness of a galaxy map?

I'm trying to imagine mystery setting when amateur astronomer stumbles upon a torrent which contains a 3D map of the Milky Way galaxy. The map contains all large objects: star systems, planets, nebulae, black holes.

Is there a way with our current knowledge to check is the map real or just an object of someone's imagination?

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How to verify correctness of a galaxy map?

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