If you completely deleted the messages, from the message box, you cannot retrieve your messages. If you cleared the messages from the chat box, you can go to your messages at the top of your fb page and click on MESSAGES, and your messages should still be there.
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how can i find deleted messages on facebook
Nope
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They may get deleted if your inbox is full, but if it's not that much, they keep it on. Most of the time you will find them in the archive section.
You can to an extent. After about 20 messages the others begin to delete.