^Exactly. It's just that most likely, the heroin is bagged up in the stamp baggies by whoever is receiving off the docks. It probably only is exchanged once, maybe twice once it's picked up at the port/delivered from the port before it gets processed and bagged.
Basically, the only people who have the ability to buy heroin in NJ before it's bagged are WAYYYY higher up than any of us will ever be connected to. And honestly, even if I had unlimited monies, I'm not so sure I'd have the balls to deal with people that well connected in criminal organizations lol. As unbreakable said as well, on the street level, heroin has been tested by the DEA that was in the 70-80% range, which I do remember reading in a newspaper article, so that's not just some guess.