The highlighted part is ILLEGAL. If you picked them up from an FFL within Maryland's borders, you both have committed a crime.
As the law is written, taking possession in Maryland is illegal. A gray area would be checked luggage at an airport- even though you bought the magazine(s) out of state. I mention this because you would be taking possession from the airline while in Maryland.
Keep it simple (and legal) by buying them in PA, DE, VA or WV and bringing them back to Maryland with you.
Re-read what he wrote, the FFL he is talking about is in PA or VA, not in MD.