How do you judge that likely? It seems just as possible if not more that it was a single lot purchased by Hezbollah for Hezbollah.

I'd guess anybody with a pager in that part of the world dumped theirs as soon as they heard what happened.

I bet lots of people with that model of pager are now ripping them open to check for explosives. If we don't see pictures of unexploded ones, then I'd guess they were all triggered, and the only ones we might see are devices that were turned off at the time.