If the transfers in question were made by the depositor's wife, your customer has a choice to make. Either he decides to pursue error resolution under ยง205.11, thereby ensuring that the bank will want to pursue the alleged thief (his wife), or he decides to, in effect, ratify the transfers, in which case they are no longer unauthorized.
In other words, he can either put in a claim that you must work, or not.
If he refuses to enter the claim, you should not refund the money. If he has entered the claim, you can decide the transactions are not unauthorized if the customer says so in writing. Otherwise, I believe you'd have to complete your investigation, which would lead to a credit to his account, and would undoubtedly lead to discovering that his wife made the transfers. Then you'd have to decide whether to prosecute her.
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8