I'll go with two mags, taped or clamped together "jungle style". The newsprint photo quality is obviously poor, but looking at the bottom of the "wrong" mag, it looks like you can see feed lips.
If that's the case, the wouldn't you end up see one of the two following results?
A) The mags are taped curve-to-curve with a vertical offset to allow the mags to be inserted after flipping them. By definition, this setup would have both mags curved the same direction. Thus, the curve is still oriented improperly.
B) The mags are taped together top-to-top with a space between to allow for magazine insertion. In this case you should see the forward curve (the proper orientation) of another magazine ahead of the improperly curved one. There is pictoral detail forward of the magazine (the trim line of the car's rear window) that makes this scenario an impossibility.
Besides, doubled-up mags are pretty thick. Even with the poor quality of the pic they would stand out like a sore thumb. In this pic the width of the mag can be determined by looking at dark strip that separates the side of the magazine facing the viewer (the lit side) and the officers arm. That dark strip is the rear of the mag and it's the same width as the bottom of the mag we can see, meaning they are the same. If it was two mags taped together the dark strip should be appx twice as wide as the bottom of the mag.
Brad