Uber around BOS airport is very reasonable. $8 will get you to the terminal from the FedEx facility and UPS is over there too. The bus is also an option but the $8 is worth it vs. freezing your @$$ at the pick up spot, ask how I know. I've rode with FedEx many times over my career, they are extremely reliable to really get anywhere you need to go. The overnight part can suck but they'll get you there. They have nothing but big, heavily equipped airplanes to get in with any weather. Add the fact that you can reserve a seat 24 hrs in advance and it's yours, just cancel it if your not going to use it because somebody else could need that seat to get to work.