Thanks. That is helpful information, 52OPS. Bank B is blowing smoke either because it's trying to call your bluff or because it hasn't got a clue what is going on, and I suspect that's because its customer has no money in the account to recover the funds from. But this is Bank B's problem, not yours. Your return was timely, and Bank B is holding the proverbial bag.
Under the Fed's July 1, 2018, amendments to Reg CC, Bank B would have some chance of recovering under an indemnity from Bank A, if in fact Bank A received not the check but an image of the check for deposit (via RDC or mobile RDC). But depending on what the payee's indorsement says, even that indemnity would not be available. In any even, that's all a pipe dream for Bank B, since the amendments creating the indemnity don't go into effect until 7/1/18.
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8