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This question was initially asking for two separate works, was trimmed down to one and reopened. As OP never came back but still provided a decent enough summary of the second question, I'm reposting it so that it doesn't get lost:

The second story is also set in a future Earth, where people live in a huge enclosed megalopolis. The outside is uninhabitable (nuclear war? pollution?) and the people who live inside are only concerned with their artificial world. However, one eccentric old man (who I think remembers how it used to be) has a hobby of sending artificial, simulacra pigeons outside. One day a real bird comes back with the simulacra, showing that the outside is habitable once more.

OP originally indicated that they read it "many years ago as a teenager", for what it's worth (i.e. not much).

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    Yes, I know that not being the OP I'll never know for certain, but the description provided seems decent enough so that if an answer is posted and it seems like a good enough match, I'll accept it.
    – Jenayah
    Commented Feb 25, 2019 at 2:05

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