Final answer:
When an auditor is unable to inspect and count a client's investment securities until after the balance sheet date, the bank should be notified to provide a list of securities added and removed from the box between the balance sheet date and the security-count date.
Step-by-step explanation:
When an auditor is unable to inspect and count a client's investment securities until after the balance sheet date, the bank where the securities are held in a safe-deposit box should be notified on or before the balance sheet date that they will be asked to provide a list of securities added and removed from the box between the balance sheet date and the security-count date.
This notification allows the auditor to obtain information about any changes in the securities held by the client after the balance sheet date.