Oh, I am all over the 1M board:
BMW 1M Forum / 1-series M Coupe Forum - BMW 1 Series Coupe Forum / 1 Series Convertible Forum (1M / tii / 135i / 128i / Coupe / Cabrio / Hatchback) (BMW E82 E88 128i 130i 135i)
Great group over there. A lot of the time they can tell me who the owner is/was, but no such luck this time. Not yet at least. There's a few tricks remaining that I can try.