Wow, I didn't hear that story. This whole law enforcement thing is a comedy of errors, but it worked better as humor in the Keystone Cops. This is discouraging and frustrating to witness the ineptitude, or whatever it is, of the systems that are supposed to protect us.
Seems to me the Boston citizens could help out a lot here. No doubt someone has seen this van, somewhere. With an adequate description, INCLUDING the physical characteristics of the driver (s), I'll bet some citizens would step up to the plate and report info to the FBI.
Boston City officials should think up a reward, motivate their community into vigilance and nail down the dirty lair of this truck.