And to migrate back to the main topic at hand, good luck getting the police to help. First off, you have to be able to convince them that Bitcoins have real value. Anything under $20 of damage is, by law, not dealt with by the police/courts. Second, you'll need to find the person who took it. Since Bitcoins are transferred anonymously, that means you'd have to get a professional cryptographer to decrypt my ZeuS and find where I'm accessing you from. And then, after all of that, you have to hope that I still have your Bitcoins. Chances are, by the time you actually figure out what's happened, I've already sold them, or transferred them to somebody else.
Showing the current exchange rates should be enough to demonstrate market value but you're absolutely right that the bigger issue is finding who stole them - that's an issue with "cybercrime" (I dislike that word, it sounds a tad pretentious) in general. Part of the price we pay for privacy is having to defend ourselves against criminals, personally I think it's worth the price.