From Steam Support
May 24, 2017
Hello,
Thank you for contacting Steam Support.
Unfortunately, there is currently no way to view the older announcements from your group.
Once a group has reached a certain amount of announcements, the older ones are no longer visible.
If there is content in your group that you wish to retrieve in the future, I would recommend backing up this information in a separate file or location.
Steam Support
Steve
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