The best way to find out if someone has issued a check to your customer. Is to ask the company if they have issued the check. The company that will be issuing the check will enter the information into the system it will be posted immediately stating that they have written a check for the customer when the customer takes that check to a check cashing facility to cash the check

All we need from the check is the NAME that the check is writing to, the date on the check the Amount of the check, the check number.