I am having trouble understanding you.   The note is in a parking lot which looks like it is for CVS/Crosby's/Dunkin, which is in Hamilton, and you say "MBTA" lot which I interpret as the one south of the CVS building, and SE of the Hamilton/Wenham station icon, which is in Wenham.

I am guessing you are local.  Are these two parking lots operated as one thing?  Do you have to pay to park to shop at Crosby's?  Can you park there and take the train?

With notes, what is helpful is to be as specific about factual observations as possible so that someone else can edit the map based on those observations, as a substitute for personal observation.