PST Import and PST Migration Policy

I have a question, when I import PST files to Enterprise Vault I will occasionally see "Items not eligible for archiving because of PST Migration Policy". Is the any way to identify which items were not imported?

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PST: Y:\PST\User - Mail.pst  -->  Archive: LastName, FirstName

 Items archived: 39072 (of 39215)
 Items failed archiving: 0
 Items not eligible for archiving because of PST Migration Policy setting: 143