You have the absolute right to reject the paper "pre-authorized draft." Here's what I think happens -- The payee of the check routinely converts checks it gets to ACH ECK formats -- ARC entries. When it realizes that a cashier's check isn't an acceptable source document, and can't lay its hands easily on the original cashier's check, it creates this spurious remotely created check.
If you are able to catch these items in time for a timely (midnight deadline) return, you can do it. They are not cashier's checks even if the payment "instructions" are derived from a cashier's check. Be aware of the consequence of the return, though -- the remitter of the cashier's check might have his/her payment to the payee reversed, making it late, etc.
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8