the real problem is assuring the chain of custody through the owner of the pager itself.

It could be in the hands of “mr bob” for example, but maybe mr bob left it at his home, or gave it to a friend to hold onto for a while, or maybe two people ended up swapping pagers accidentally, there’s no trivial way to know the immediate distribution of pagers either, so you should probably assume it’s random, as distributing them alphabetically is probably unlikely. Although it is technically possible.

I just don’t really know of a good way of specifically targeting a single pager with the intent of actually make the one you need go off, the obvious problem if you fuck up, is that within a few hours, everybody knows you fucked up. All of those pagers are now going to be gone.