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To see which archive records are coming from, click the button and you'll see the first column on the right is a hidden "Source Table" column.
You can treat the column just like any other: sort by it, filter (keep in mind, the Table Selector is the recommended way to filter by Source Table), move it to a different position, etc. You can omit it from Perspectives by hiding it, but this special column will always be available from the Preferences dialog.
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