I'm sorry to hear you're unable to find the email campaign you're looking for. Are you also unable to find your campaign in the trash folder? When was this email sent? Do you remember the name of the campaign you are looking for? If you can recall the email's name I would suggest searching it in your account. In the meantime I have taken a look at your account and was able to find emails dating back to January 10, 2017. Sorting your campaigns old-new is also a helpful step to take so the emails sent in 2017 will appear first.