Great question — answering as the UphillTech team:
Old eggs, and low quality eggs, can sometimes have broken yolks in the shell from rough handling. Obviously that’s a problem if you wanted to separate them or keep the yolks intact, but it’s not a safety issue. If there’s no rotten egg smell, you can use as normal.
Full answer by Sneftel: https://cooking.stackexchange.com/a/130200 (CC BY-SA 4.0).
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