I lov a good vintag black flag shirt but there is no way I can verify if these are legit. Actually the first one I can tell you as fact that it is nowhere near vintage so that BIN price is just crazy.
The 2nd one is harder to tell. It looks like an old shirt but in my vintage select store diggings I see tons of fake old shirts. Even fake old vintage core tees. Including this design. Its usually a shite shirt with black ink or navy shirt with yellow. They shirts all look so old and the ink is worn through but it just feels off in your hand if youve handled enough old HC shirts. If you have any doubts try to track down chuck dukowski. He was on ebay for a minute selling stuff. Maybe he will verify?