Hi anonymous user
Have you checked if the items can be found in Recover Deleted Items of the shared mailbox? Please note that: 'folders' can't be 'recovered', only messages
Or in Exchange server side: Recover deleted messages in a user's mailbox in Exchange Online
We could refer to the methods introduced in this link to recover deleted items in O365. Recover deleted mail items – Office 365
- Recovering deleted mail items by using Outlook and OWA mail clients.
- Recovering deleted mail items by using MFCMAPI utility.
- Recovering deleted mail items by using Exchange In-Place eDiscovery and Hold.
- Recovering deleted mail items by using the PowerShell cmdlets New-ComplianceSearch
Use Compliance Search to search all mailboxes in Exchange Server
New-ComplianceSearch: how to use the newer version of Search-Mailbox
By the way, you could set up mailbox auditing - it logs who performed hard and soft deletions among other things.
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