I've seen enough complete sets and solo autographs of the Beatles send to me by US collectors and fans authenticated by JSA I always recommended not to buy!
You’ve seen a JSA authenticated set in which all four signatures weren’t authentic? I don’t think I’ve ever seen that.
Maybe ballroomdays67, think it was in January or February this year and was cancelled at ebay. I do not save cancelled auctions at ebay anymore and I do not check the US market since approx. 10 or 12 months. There are too much fakes in US and hope they never appear here in europe.