True, I think most of these events are "no questions asked".
But technically if an AFT agent were there observing any of these buy backs, what's to stop them from charging him with say 60 counts of violating the NFA?
Looked like a pile of single shot 22 pistols - no NFA violation, still no federal law prohibiting home-made guns. And since the state's representatives decided to give amnesty - there was little risk of violating NY state law.