sharepoint online – Restore Missing Files

We have a group of users who say they’ve deleted a bunch of files from their Archive Document Library. We see nothing in the recycle bin confirming that. Nothing in the Audit & Compliance report shows deletion. I’ve tried Powershell, OneDrive & Desktop Recycle bins but no leads.

If they deleted it over 93 days ago, is it possible Microsoft can find and restore a site collection from a specific date? Or are they SOL?