At first I speculated that one of the show runners hid the cross at Smith's Cove and the Laginas just happened to find it. However, after no mention of having the cross tested after several weeks, tells me that everyone is all in on the hoax. If there's actual documentation that Templars smuggled gold inside lead, they should've ran to the university to get it tested. At this point I wouldn't be surprised if the jewelry from next week was planted as well.