I agree that it seems to be a beer bottle, at first I thought it was the back of a box of cornflakes.
I notice a certain red sofa on the right of the photo - we've seen Ratzi sitting on it in a number of photos. Could this interior be a room at the CDF, then? It seems to be one which he regularly used, anyway.
I should like to sit on that sofa, and pour coffee and cut cake...... it is so very elegant