You can check the timestamp on the story or look for any mentions of when it was first published. Some news sites might have this info clearly displayed.
The easiest way is to look for the date and time stamp on the article itself. If it's not clear, you can try using search engines and sorting the results by date to see which one appeared first. Another option is to check the social media posts related to the story to see when they were shared initially.
One way to find out is by looking at the publication date and time provided by the news company. Also, you could search for the story on multiple news platforms and compare the posting times. Sometimes, you might need to dig into the article's metadata or check with specialized tools for this kind of verification.