One must assume the Hanover PD investigated, and, if there were pressure cooker parts or other similarities to the Marathon bombs, we would have heard about it by now.
Yes! I do recall articles with those tweets. Thanks for finding them. These tweets are probably the source of the comments at the Patch.
Hanover and State police may not make public all they know. They may even issue disinfo to smoke out any accomplices.
Just a short link-hop from your link
http://jesterscourt.cc/2013/04/23/boston-marathon-bombing-just-a-hunch/