You can view it with a spectrogram, audio which has been lossily encoded will have a telltale cutoff in the high frequencies. The lossier the encoding, the lower the frequency ceiling will be.
Another thing to look for is deleted or very flat energy between harmonics. Reducing bit rate in inter harmonic regions is most of what's meant by 'psychoacoustics.'
I imagine low pass filtering depends a bit on which compression you're using.
None of these tricks will work for detecting GAN compressed audio, though.
