Thanks to Richard for bringing the whole fiasco to our attention, thought I would update with what I gleaned from the news.

Turner, contractor to pay $2M in Boston bomb scare

More info here.

and a video of Peter Berdovsky and Sean Stevens - currently pending trial - putting up the hoax devices/"bombs" in an ill-fated advertising campaign.

which if you go to the Graffiti Research website here, have a solution to further prevent "bombing" within the city along with their own campaign to free Berdovsky.