Len,
Was this under the rear seats? This is the car from ME, right?
It is as close to a build sheet you'll find on a BMW. I've found these on the older cars, some E30 M3s, but only on cars that haven't been all apart and very original.
funny story, a couple years ago we were building an E30 M3 for racing. High mileage but very original car. Under the rear floor carpet, (these cars have one piece carpeting) we found a beer bottle cap, well adhered to the sound deadening. It was from a bottle of SPATEN . .brewed in Munich. I mentioned this to a BMW AG employee at an event, his reply, Back then beir was regularly consumed on the factory floor . .