How to tell if something is anycasted?

So I'm looking at a company who offers anycasted DNS; how do I tell if it's really anycasted? Just hop on different route servers to see if I can find different AS paths and then do traceroutes to see if they suggest the packets are not ending in the same location?

From my routers' perspective I don't see a difference, but then I don't think I should, correct?

Thanks, David