Yeah the real trick is finding where the upstream GFCI device is located.
I always look at where the panel is, and try to figure out what the closest location a GFCI might have been located. Other bathrooms, outside, garage, basement...
With the cost & requirement of AFCI breakers today, I just make it an AFCI/GFCI an forgo the GFCI receptacle completely. That should make it easier on everyone, especially with 2023 code requirements.... ouch