F3G,
Well, until 1995 there were Marche Ouverts in England, at least, where stuff bought in good faith acquired proper title. Highly unlikely that an entire aircraft would be offered there (!), but radio, comms, spares etc might have been?
Marché ouvert - Wikipedia, the free encyclopedia
More particularly, just wanted to make it clear that I am not suggesting in any way that the current owner is "the artist".