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here and scroll down to Admin Ruling 88-2. Print copies for your friends.
The obligation to file the CMIR is solely on the person who transports, mails, ships or receives, or causes or attempts to transport, mail, ship or receive. No other person is under any obligation to file a CMIR. Due to its age, this resource does not mention the possibility that you might consider a SAR filing if you become aware that your customer is not properly reporting the transactions.
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In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.