That always sucks, hope he had full coverage on it. I remember the days when I lived in an apartment. I actually drilled a hole in the concrete and set an anchor with an eye bolt in it. That way I could run a chain through it and my wheel. I was fortunate enough that I also had a breezeway that I was able to park mine in so it wasn't in plain view of the street.

If you are keeping yours in the back of your truck, run a cable through your rim to one of the tie down points with a lock on it. It's easier for them to take it from the back of a truck to a van because they don't have to lift it much.

I always do as much as possable to make it harder for thieves to get my shit. Mine now stays in a locked garage, with the alarm and disc lock on at all times!

And good luck with finding it.