Well to find out for any game you can start making a giveaway and see if it shows up when you try to enter the title. If it doesn't show up (especially if its old and bundled), then it's probably on the free list and can't be given out.
Nosferatu specifically is, and you can get a list of other ones here https://www.steamgifts.com/discussion/pJRbR/can-we-have-a-list-of-games-that-cannot-be-created-as-giveaway-unofficial-list-inside
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https://www.steamgifts.com/discussions/search?q=nosferatu
Limited, uhu. Think it been free several times.
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Is it allowed to give away a game which was free 2 years ago? (but only a limited number of copies)
Here is the website where the keys were given:
http://www.epicbundle.com/article/steam-key-for-free-nosferatu-the-wrath-of-malachi
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