After extensive legal proceedings, a German court has rebuked German cultural property crusader Michael Müller-Karpe for wrongfully claiming that a German dealer was selling stolen artifacts. See http://www.coinsweekly.com/en/News/4?&id=221
Given the low value of the artifacts in question, most dealers would have just abandoned the property rather than take the abuse from Müller-Karpe and pay for legal representation.
One wonders whether there will be any further ramifications for Müller-Karpe. Hopefully, the ruling will act at least some disincentive for his brand of cultural property vigilantism.