I have this MacBook Pro 16in 2021 model in Space Gray for sale. It has M1 Pro 10-core CPU and 16-core GPU, 16GB Ram and 1TB SSD. It is currently covered under AppleCare for Enterprise Warranty. But I can not guarantee how long AppleCare will last. The screen back cover has a small dent as shown in one photo, which does not affect the screen at all.

The only issue is that this MacBook is enrolled in an MDM service. I have bypassed the MDM and now there is no MDM profile installed on it and it is fully functional just like any other MacBook Pro 16in purchased from Apple Store directly. It is in open box condition (except the dent) with battery cycle 3. The listing includes the MacBook itself and a charger in its original retail box. 

If you would like to factory reset this MacBook, you need to bypass it again. Please google for instructions to bypass MDM. The current MacOS on this MacBook is Monterey and the online MDM bypass instructions are currently for Monterey only. Thanks for looking.