Quinn already has the cocaine because she hides it in EP7.
It doesn't matter if you doubt or not that Vinny is on the scene. Your doubt is as much a possibility as my fear that he is there.
Even if he is not there, the whole Buddy store could be under surveillance. In EP6, the police were there too. Now if a guy who can be mistaken for Vinny is there in an expensive car, there are complications for the MC. Then when they search his room and then also find a fake ID, one thing leads to another. Quinn is told to pick up her drugs by bus.