Different banks have different policies. The more information you provide the better. Ideally, if you have the bank account number then there typically should not be a problem getting a response from the bank. Although a bank could notify the signers, in my experience they typically do not. They will simply respond that the account is closed and will supply whatever information they still have.
The information you obtain at this site is not, nor is it intended to be, legal advice. You should consult an attorney for advice regarding your individual situation. We invite you to contact us and welcome your calls, letters and electronic mail. Contacting us does not create an attorney-client relationship. Please do not send any confidential information to us until such time as an attorney-client relationship has been established.