Unfortunately every fingerprint reader outputs a unique hash per fingerprint, which is why if you break it you can loose all of your data. So even with a thiefs hash's you'd still need the thief to prove it was them.
I'm being a bit pedantic about the "every fingerprint reader" mention and am assuming that mention also includes non-Apple devices. HTC and Samsung phones have, in the past, stored fingerprint images in an accessible location. What's worse was that the fingerprint image would be refreshed with every swipe/finger touch!
