There is alot of animosity to allowing anything to prove Jesus. And alot of fakes to be sure - but this one is still up in the air, from all that I have read.
That's one of the reasons I let my BAR subscription lapse a couple of years ago. I got tired of Hershel Shanks defending what I assumed to be a fake. I recently resubscribed but maybe I need to re-examine my original assumption. We'll probably never know for sure if this is authentic. Of course, even if it is 2,000 years old it doesn't mean it refers to THE Jesus, THE James and THE Joseph.