That was the first thing I removed when I got my 2020 MS home new. Unfortunately, I need to keep it for whenever I sell the car. I can't imagine it costs very much. You can find out how much by creating a service ticket, other, and specify Parts Only. They will give you an estimate to approve. Here is the part:
MS PARCEL SHELF ASSY | 1120212-00-B | Over-the-Counter(No VIN) |