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Long story short, how can I check which users touch/used the Advanced Find button for the past 3 months?
Pretty sure there is no way of auditing that. You can audit users accessing multiple record views which includes sub-grids and advanced find searches but not specifically advanced find.
I can be wrong but this is not the information that is logged. AFAIK it's possible to audit only CRUD operations with data and User logging in events - docs.microsoft.com/.../audit-entity-data-changes
Not sure about advance find. But on some button click you can have some work, write some logic to create access log. We have js which creates access log records when a collapsed tab having sensitive information is expanded.
the out of the box Auditing functionality does not support this requirement.
For further auditing capabilities, I would recommend to explore & test Activity Logging of the O365 Security & Compliance Center
This contains more capabilities and might be useful for your auditing requirements
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