Equipment return kit

Service was cancelled end of October 2023 but billing cycle deemed disconnect date as 11/14/23. Today, November 25th, received in mail a letter relaying kit to arrive in 4-7 days. Also, equipment must be returned by 21 days from deactivation to avoid additional fees. I have a trip December 1-10. How do I expedite the kit or resolve in another manner? Local AT&T store won't accept. No distribution centers anywhere near me to my knowledge.  I feel there was amply time to get the kit to me in a timely manner. Now I have to worry about timeliness because there was no sense of timeliness on Directv's part. Thx for any advice.