not sure where you were searching so far, but only if the property is listed exclusively with a real-estate broker it will be offered via the MLS system and the sold info, that will also be recorded in MLS, may link to the various websites. If however the property sold privately, the info may appear on websites as Zillow and Trulia, but checking the appropriate Registry of deeds, in your case Middle Berkshirre Registry, will provide you with the public info that you may be seeking.
Should you need any real estate assistance in the future, please don't hesitate to contact me.
Assoc. Broker, ABR
Century 21 Franklin Street
413 528-8118, ext. 17