Even fancy new games with 100+ audio channels are using 128Kbps audio. It just doesn't matter when it's sound effects, and the quality of a soundtrack in the actual game itself is almost irrelevant when sound effects are layered on top of it.

Look through the game files. I almost challenge you to find something above 256Kbkps VBR. Even that is a stretch. You won't find lossless anything anywhere.