Because many older "FLAC" versions of this album found on the internet are actually transcoded MP3s, you can use these methods to ensure yours is legitimate:
Running the files through a tool like Spek confirms that the frequency shelf doesn't cut off at 16kHz or 20kHz, proving it is a true lossless source and not a "transcode" (an MP3 upscaled to a larger file size). The Verdict tool 10000 days flac verified
As mentioned, a quick check in a spectral analyzer should show no artificial frequency capping. Dynamic Range: 10,000 Days Because many older "FLAC" versions of this album
Interpretation: