I addressed this a long long time ago in this thread. Pierce was asked a direct question about whether you can sell guns not physically present. He answered correctly. The exchange was bookended by "gun shows with secured guns are ok." Start listening at 23:41. Pierce directly answers that a gun show is an "event" and can be conducted under terms of exception, i.e., in immediate possession of authorized participant or secured. There is not even the slightest ambiguity in how he answers the question. The 9th circuit may have bought the plaintiffs' interpretation ("we can't comply with the exception") but it cannot be reasonably denied that Pierce said what he said.