If this service is promoted to your customers as acting as "eyes and ears" for the customer, I believe your customer's expectation is that the service provides the notice on their behalf. While there is nothing specific in the regulation indicating that notice by a third party constitutes notice under 205.11, I think you could make a strong argument that this service acts as your customers' agent in these cases.
If, on the other hand, you don't promote the service, and it's duty is to you (and not the customer), I think you treat a notice as knowledge obtained by the bank on its own, which still requires that you correct the error, but does not subject you to the rigors of complying with section 205.11 rules.
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8