If the archive was populated by PST import, and this PST did contain a known folder structure, you may use the LOCN attribute in which to show the original folder location using Enterprise Vault Search (EVS).

1. Navigate to [EVServerName.Domain]/EnterpriseVault/Search/shell.aspx
2. With desired results showing in the search display, right-click on a column title, and select 'Customize Columns'
3. In an available field, select 'Other' from the dropdown menu
4. Type locn in the 'Property Name' field
5. Type Location in the 'Column Header' field
6. Click on the 'Done' button

Your results will now show the folder name and path an item was in from when it was imported via PST file.