When searching for an email older than 180 days in Outlook for Mac, there are a few ways to find emails that have been moved to the Online Archive.
Select the Online Archive Mailbox and / or the sub-folder you would like to search, and enter the search term as you would normally in the search Box. This should bring up any matching items within the folder you have highlighted/selected. Be sure "search current mailbox is selected" and that you have highlighted the Inbox or a specific folder in the Online Archive found in the folder list / Sidebar on the left hand side of Outlook:
Bradley Russell
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