I hope Mass law is more narrow than RI law, because in RI, there are parts that are fully left out, similar to what you are asking. The bottom line is, you are protected to a certain extent by the health department. Once you leave their area of coverage, the health department cannot recognize you as following their protocol, and you will be up for all sorts of prosecution. You can do exactly what you said, but if anyone shows up to the residency, and you are not there to claim the plants, your friend will be arrested.