Regarding notice of a returned item deposited to their account, you do have a responsibility and possible liability under Reg CC 229.33(d):
(d) Notification to customer. If the depositary bank receives a returned check or notice of nonpayment, it shall send notice to its customer of the facts by midnight of the banking day following the banking day on which it received the returned check or notice, or within a longer reasonable time.
Basically, if they suffer a loss due to untimely notice, they could try to hold the bank responsible. This is why if you automatically represent returned items a second or third time for a customer you are wise to have a hold harmless agreement in place for delayed notification.
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