Hi @BmoreOs ,
Microsoft Purview provides three eDiscovery solutions: Content search, eDiscovery (Standard), and eDiscovery (Premium).
According to your description , I would suggest that you could refer to the following link to search and export emails you need by using eDiscovery (Standard).
Create eDiscovery holds in a eDiscovery (Standard) case - Microsoft Purview (compliance) | Microsoft Learn
Then refer to the following steps to export the searched Exchange content searched as one PST file:
Export Content search results - Microsoft Purview (compliance) | Microsoft Learn
*Note: To export search results, you have to be assigned the eDiscovery Manager role in Microsoft Purview compliance portal. It isn't assigned by default to the Organization Management role group. *
At last ,you could import this PST file into the particular staff member’s mailbox:
Import email, contacts, and calendar from an Outlook .pst file (microsoft.com)
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