Cherry MX Browns are reasonably quiet. My local Micro Center has a tester keyboard with a variety of switches that you can try. If you look outside the limited options there, you can find huge selections of mechanical switches that are only slightly louder than membranes. You’re looking for linear or tactile switches and you can find a pretty complete list at https://deskthority.net/wiki/Main_Page in the “Keyboard Switches” section. You can even mod louder switches with O-rings to dampen the noise.
I agree, MX Brown are silent enough to not get notice.
I guess it's a positive side effect of open spaces: there is so much noise around from phone calls and co-workers discussing that it doesn't make any difference.
More seriously, I've a Ducky keyboard with MX Browns (and it's also a weird one with MX Blues (the noisier ones) for the arrows and page UP/DOWN), and I never got any remark for that.
The only story I've heard from colleagues complaining about keystroke noises was for a friend that has a really heavy typing (to the point of cracking the key caps), and even in this case, rubber O-rings did the trick to dampened the noise enough.
