Open the file in software like Spek or Audacity. A genuine studio M4A (AAC 256kbps or higher) will show a frequency cut-off around 20 kHz (for lossy) or no cut-off (for lossless). Fake files (transcoded from 128kbps MP3) will show sharp, blocky cut-offs around 16 kHz.
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Here’s a short piece contextualizing what that probably means for those who come across the term: Open the file in software like Spek or Audacity