Cardholder stated he wasn't sure about that. He said he does have a Google account & he would look into it.
1005.6(b)(2) - Timely notice not given. If the consumer fails to notify the financial institution within two business days after learning of the loss or theft of the access device,
You notified your cardholder the card was blocked due to too many transactions to Google. Cardholder states he's not sure and will look into the transactions. At this point, I would not consider him to have knowledge of loss or theft. Less than a week later (4 or 5 days per your post) he confirms these as fraudulent transactions. Two of those days were non-banking days, so this is reduced really to only 2 or 3 days. When did he learn of the loss/theft? I would be hard pressed to argue against your customer. You notified, he said he would look, he did and states they're unauthorized all within a few days.
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