When previewing emails within GoldFynch, you may notice the word "SENT" in line with each email (shown below).
While it may appear as if all of these emails were "SENT" from the imported inbox, that is actually not the case. This label indicates that the primary date of the file is the "SENT" date, as opposed to the "Ingested", "Received", "Last modified", or "Created" date. The "SENT" date is the default primary date for emails, which is why this is commonly seen in large lists of emails. That being said, this does not automatically mean none of these were "SENT" from the imported inbox, simply that the primary date used is the "SENT" date. This is why the label appears right next to the shown "Date" when previewing a list of emails.