if it helps you as reference, I recently pick up a openbox M3 Pro 16" I think the base model, 18gb ram, 512gb for $1200 from microcenter. I am returning it tomorrow as it is just too bulky for me. I will use my loyal M1 Pro 14" for a bit longer.
I have a 16” m4 max with 128gb ram, 8tb storage and nano texture screen I am about to list. Have box and all, like new with I think 5 battery cycles. Msg me if you may be interested.