The typed date at the top of the stationery read November fourth.

Caroline turned the outer white envelope over to look at the red postal meter stamp near the upper right corner.

The stamped ink mark from the mail processing center read November ninth.

She looked back at the typed text inside the letter, where the second sentence stated that any official inquiries regarding corporate files had to be lodged within four business days of the letter date.

Four business days from November fourth was November eighth.