There is more than one possibility here. The second part of the inscription could have been added by a pilgrim in the first centuries for whatever reason if the ossuary were a recognized relic then; the inscription could have been added by the finder of the piece or by the dealer he sold it to in order to get a higher price for it.In the first instance could we call it a hoax? If the second supposition is true then analysis will surely show that. I will wait for the articles and controversy that are sure to come in the next few issues of BAR. Alone, "Jacob son of Joseph" proves nothing as there were many Jacobs and Josephs and Joshua was one of the most common names of the time.