run to your bank now., they can put an alert on that account. they will open you a new account. you can pick your number. just continue with the next number. the down side is you will have to buy new checks. at my bank we would print you some temps. they look just like checks. these services are all free at my bank. i just retired from banking. contact who the check was written to,so their bank can put an alert on that check number.