according to this article, he was probably staying with his cousin who made him Dinner. I wonder where they parked. According to this, he was seen at the Boston Public Market. According to their FB page https://www.facebook.com/pages/Boston-Public-Market/848877121869970?fref=ts there is parking that you wouldn't even have to go outside, elevators etc. If they parked there ( again, don't know where they parked if at all) there could be something hinky with that garage. Again, just guessing!
I think it means he was seen outside the Boston Public Market by the cameras, there's no way that would be open at 1:30 AM at night, in fact it was probably already closed at the time they arrived at the bar, I'm sure he was never in there that night. I mean the pictures from the market are the ones in the fist post here. There's no direct entrance from parking to the bar. The market is near the train station though if that's where he was heading...