In 1974 I was doing some work for Robinson's in Victoria BC. They received a shipment of supposedly unissued P08 pistols with matching accessories. These were in a separate crate from the main order which was a bunch of issued pistols, still in their holsters with spare mags but the whole crate was floated to the top in cosmoline. Guess what my "work" was.
I never got a chance to purchase one of those fantastic pistols as they were all sold within a few hours of arrival. I don't know the whole story behind those pistols but the one I was allowed to look at was wrapped in brown grease paper in a black box with a white interior. Both mags which matched the pistol were in a separate box as were the loading tool and holster. The holsters were all brown in color from what I remember. The price on these pieces was about 10 times that of the issue pieces. Well worth it IMHO.
If that holster were brown I would suggest it might be part of that batch. Likely there were other such batches available at the time.