(a) No financial institution may issue or sell a bank check or draft, cashier's check, money order or traveler's check for $3,000 or more in currency unless it maintains records of the following information...
Your bank did not sell a cashier's check. You issued it for internal purposes only. It does not make any difference if you showed the customer as the remitter or simply left it blank; your customer did not purchase the check.
If you keep these records via a log, listing this transaction there might create as much confusion as it avoids. You might simply make a note on the register copy of the check in order to enlighten any reviewer.
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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.