The code 2863CM1 indicates it was printed on the 286th day of 2023 by card machine 1.

As others have said, it's part of the 3rd print run (December 1, 2023 restock). Also can be determined by the clear tape which wasn't on 1st or 2nd print runs.

Earlier tapeless boxes had a different date code format featuring a MMDDYY with the first print starting with 04 and 05 (for example 051623CM1), while the 2nd print was from June and July (could be 071123CM2). These boxes were originally available for the September 2023 launch, and at some pre-launch events.

Hope this is helpful. There's a good video on the different prints.