Most common fix: check you selected the right contact.
If results seem to stop at a certain date (for example, here's nothing after December), it's often because the WhatsApp comtacted was selected instead of the iPhone one.
This happens when the person has both a phone number and a WhatsApp contact, and the wrong one is chosen.
Or it could be the contact is saved under different names: You might have the same person saved as "John Smith" in one place and "John" in another. Re-export and include all name variations.
The conversation is in a different group chat: You exported one group, but the messages you need live in another. Check which groups the person is in and export each one separately.
iMessage switched between phone and email (iPhone users only): The other person's iMessages may have switched between their phone number and email. When selecting contacts, include both the phone number and the email address for that person.
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