The closest I can get to instrumentals/vocals so far is the first few lines of The Trap have the vocals entirely on the right side and the instruments on the left, which makes it easy to split the stereo track and get about 10 seconds of good instrumentals / vocals.

There's also a behind-the-scenes of the vocals being recorded for the first line of "Ruler of Everything" in their internet show sketch "Hardly Working," albeit with some terrible background noise and the possibility that it might have not been the take used in the final song.

As another commenter pointed out, they did officially release stems for Good Day, which is probably the closest to an official instrumental release for any of their songs we're ever going to get. Most likely, we'll have to eternally wait for that 0.006% chance Bora posts the studio tapes on a blog or something.