The cache is not located at the posted coordinates.
There are many KenKen puzzle caches out there but I haven't seen any in the Boston area so I figured I'd remedy that. If you are unfamiliar with the puzzle see instructions here.
N42 red gray. green (pink - brown) salmon
W071 (yellow - blue) aquamarine. purple orange periwinkle
Cache location is available during daylight hours. Cache container is somewhere between a micro and a small container. Bring your own pen. FTF prize will be on the outside of the container.
You can check your answers for this puzzle on GeoChecker.com.