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I would go ahead and send it registered mail with return receipt and put a note on it saying why it is separate also put any numbers on it and the note that you have from the DPS.
Explain that it needs to be put with your CHL application on the note, and you might call the DPS CHL Division and talk to someone and explain what happened and take their name and the date and put on the note.
Ask them if it needs to come attention to who? Maybe to the person you are talking to at the DPS.