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If you have followed the proper de-dupe criteria, then duplicate records will not be created. Now assume, during import if you have already duplicate records, then Marketo will not allow to create new record, instead it will update last modified record. Temporarily, you can use a filter where you can check for updated At field with in that data range to see only record that you recently imported. Specially you can check for lead attribute "Updated At" list import date. It will give very close results.
Broader solution is ti merge the duplicate records. I do have developed a lead merge tool based web services API, which I use to run every 3 month to make sure duplicate are cleaned.
Thank you for your help. What we found out was the sample email does not reflect the filters that are set in the Smartlist. It is only there to test the content (i.e. tokens). I know that seems pretty simple, but as a newbie my mind automatically associated that a sample email send from a program would draw the data associated with that program (including the leads that were associated to the list created in the Smartlist of that section). And sure, the sample email would draw that data if I had chosen then correct email record. Note, that the email record was a duplicate, so I didn't realize that even in the sample email environment that it would pull the first know record.
Anyways. In case anyone else comes across this discussion, I wanted them to know that the Sample Email with lead info is NOT associated in anyway to the Smartlist filters used in that program.