Oooo.... so after some sleuthing... I think I found the exact switch / button used.
Oh wait. Maybe not... on the right track but I think not QUITE... ugh.
demonstrating my and
BRRogers' obsessive compulsion for detail... let me explain.
so I happened to find this:
which I got super excited about because it seems to fit the appearances of the button. It is cloudy white when not illuminated and when it is, it is a sky blue sort of color.
The above switch does both. Cloudy white and full RGB surface illuminated.
and, bonus... it's capacitive (touch)!
size is correct as well as bezel shape.
and then... wah wah wahhhhh....
looking again closely at photos.. the bezel color matches the coppery body and not the switch housing block...
Note the color comparison to the coppery body and the adjacent switch block:
Now I suppose they could have plated the bezel... or.. not quite the right switch yet.. but getting closer