the bootlegers might only have had access to the MP3 version. Which has happened many times before. For instance the unreleased "Toy" album of David Bowie from 2001 that the bootlegers got a hold of. Only MP3 version exist. The lossless files are still in Bowie's vault.
you got a point there. i have several versions of TOY , all MP3 based, even though covers claim