WJH believes that JS likely owned the talisman.
William J. Hamblin, "That Old Black Magic," FARMS Review of Books 12, no. 2 (2000), 329
Since I will no doubt be misinterpreted, let me clarify my position. Personally, I suspect that Joseph did, in fact, own the talisman. However, it is possible that some of the Bidamon artifacts, including the talisman, might not be authentic; this issue merits further investigation.