Let's suppose, just for sh!ts and giggles, that a world famous spy agency decided to fiddle with a bunch of pagers and blow up a few unpleasant people. Let's also suppose that doing the job required operators to intercept (a) shipment(s) and tamper with items.
Does anyone really think that those items would ever have landed anywhere near the home of the famous spy agency?
Also does anyone actually expect that famous spy agency to say, "hey, look, it was us"?
I think this was a 'neat' operation by someone; I also think the primary aim wasn't to kill or maim anyone - it was to spread fear and suspicion within the ranks of Hezbollah.