The very practical problem is how to handle the check if it is, in fact, received as a return item. You can protest loud and long, but if mega-bank digs in its heels (as mega-banks often do), your argument may have to be escalated to the legal department or to outside counsel. If you've already given your customer value for the check, you're a holder in due course, and you have that status going for you (such as it is), in addition to the claim you can make under UCC 3-411 and/or 412.
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8