Well they're asking the respective artists to come forward and claim the tapes. If they don't, then the studios will start destroying them in May.
Not sure I could personally destroy master tapes of any of the bands who have recorded there, even if they are only average demos at best, they are still pieces of art!
The tapes are going back to the bands, and the studio knows nothing of any sale/auction of the material.
And by the way, Bono was in Germany the other day, met Angela Merkel and Germany's ONE activists. ONE ad (in German): He also posed for Jens Koch to promote ONE: