This is preferable. I wouldn't trust a cashier to detect fraud in any trustworthy rate. That wording in the guideline is important. Suspicion of fraud is not fraud. Acting upon employee suspicion would just skyrocket costumer outbursts and complaints.
> If the answer is yes to any of those, decline the transfer and give them a pamphlet on common scams. This would take care of about 90% of the problem.
Decline the transfer. You would be surprised on the latter though - people have walked their family through the scam, "No, I still think it's probably legit", even gotten police involved, "ma'am, these people online are scamming you", "But what if they're not?"