Since you sell money orders to non-customers, I would assume they use cash to purchase them. In that case, you are required to gather data for the sale of monetary instruments in excess of $3,000. While the data is basically the same thing you'd gather for CIP, you aren't doing it to meet the CIP requirement. You're doing it to meet the record keeping requirement for MIs.
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Of all the things I've lost, I miss my mind the most.