If the member closed their account in November, they would receive a final statement for their November transactions but will not receive a December Statement as they did not have any transactions in December and the account was not active.
This would also be true for members who closed their accounts earlier in the year. For example, for a membership closed in April, the member will receive their final statement at the end of April then will not receive another statement again (not even the quarterly statement in June, such as if that member previously received only quarterly statements).
Even if your credit union chooses to use statements as a substitute 1099-INT, tax information is sent to closed members on a separate 1099-INT form.