You may also want to put a credit watch on your three credit reporting accounts - Experian, TransUnion and Equifax. Depending on what information was printed on the check (name, address, phone number and/or drivers' license number), they can take that and the checking account number and sometimes open credit accounts. You also have the option in some states to freeze your credit for a fee, meaning you have to unfreeze it by paying a fee before you or anyone posing as you can open another credit account. That will stop would-be thieves in their tracks.