Some Zotero files missing on Mac

Greetings: My new colleague cannot see some of our older Zotero files on his Mac. I can see these files as clear as day on my PC, but they are missing from his folder list. Seems to me this may be due to a syncing error, but he says his Zotero page is syncing properly, and my Zotero page shows no unresolved syncing errors. Any guidance for me? Thank you.
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