I personally would just let the seller have a bank explain cashier's checks to them. They aren't as easily 'voidable' as just calling the issuing bank. Along with notarization of intent to purchase, the buyer (in a legitimate transaction turned fraudulent by the buyer) would be in legal trouble for trying to cancel/stop pay a cashier's check they used to purchase something.
It also doesn't go back into your account for 90 days without you bringing in the original cashier's check. I don't expect fraudsters to want to have money tied up this long. A wire on the other hand is instant (from your account at least) and cannot be cancelled or reversed. Cashier's check essentially removes trust from the equation
https://www.thebalance.com/lost-or-s...need-it-315028