Did it appears as though anything had been ransacked, or was anything missing that you've noticed? If not, I'd suspect you experienced an electrical issue as I doubt someone would unlock and open everything just because they could. The open trunk lid would just draw attention to them as well, so I wouldn't think they'd leave that open unless they were scared away.
There are "only" like 3 billion codes for the hopping key fobs, maybe you happened to park near someone on the same code. Is there an "open all" feature on the fob, or would opening the doors, trunk, and fuel filler door require at least 3 fob button presses?
-Rod