If someone physically steal your things, and those were the only copies, you are screwed anyway, encryption or not. If you had copies somewhere else then it's a different story (but still, they need to be easily accessible by your loved ones).
In your scenario the only threat is that the thief is interested somehow in your data and will use it against you (which might be totally possible depending on the data and your exposure, but usually those things are re-sold in some kind of pawn shop).
Also, I still think that