@kjohn1234 there are escrow services (PayPal is not an escrow service) but both of you would have to agree to use one, and it would cost money and add complexity.
If neither of you has any particular reason to trust the other, then the only time you should use a cashier's check is when you would also use cash—in other words for an in-person sale.
If neither of you has any particular reason to trust the other, then the only time you should use a cashier's check is when you would also use cash—in other words for an in-person sale.