Search returns unexpected emails

I was trying to search on a result in the email body that should be unique for each drive that I backup. However, the search is returning unexepected emails.

This is my search criteria.

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This particular search item only appears once in each email based on the drive being backed up. The drive being backed up is actually the last letter in the search. However it appears that eMClient’s just retruning the entire list of emails. There are 1,933 emails in the folder and that’s how many the search returns.