Back in 2012, Peter Connelly, composer and sound designer of the first Tomb Raider games, released the raw and untouched soundtracks for some games he worked on through his Soundcloud page. Sometime later that account was closed and replaced with a new one, but he didn't reupload the soundtracks.
On a side note, a couple of years later, Crystal Dynamics followed the same trend, releasing the soundtrack to Lara Croft and the Temple of Osiris through Soundcloud for free. However, after a few years, they disabled the option to download the .wav lossless files, and the tracks can now be only downloaded with browser extensions in .mp3 format.
Most of the tracks are not completely lost, being available on YouTube (meaning that they are now in lossy format), but some are still missing.
Since they have been available for some years, there's a high chance that some fans still have the original lossless .wav files.