Open Gmail on your browser or app
Use the search bar to find the archived email
Search by sender, subject, keyword, or date
Click the More menu on the left sidebar
Select All Mail
Look for emails without the Inbox label
Open the archived email
Click Move to Inbox if you want to restore it to the Inbox
On mobile, tap the menu icon and select All Mail
Use search filters like from:, subject:, or has:nouserlabels to narrow results