Folders disappeared on Group Library

Several folders disappeared on a Group Library that my account hosts. I'm wondering if someone who was a part of the group deleted them, thinking they were only taking them off of their view, not meaning to delete them entirely. However it happened, is there a way to restore deleted folders?
Perhaps a way to retrieve them from old caches on my own computer, or access the Zotero standalone of someone in the group who hasn't refreshed in a while?
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