So one of the reasons they knew that following the couriers had led them to an important place -- beyond that it was oversized for the area and very well defended -- was that it had no internet. Someone rich enough for such security would have had internet, unless this was a place that was trying to hide.
That is, its hiddenness from the grid made it suspicious.
It's like when police profilers realize that they are being so cleverly screwed with that they are able to ID the unsub/doer as expolice.
If you outsmart me I go look for you at Harvard, Mensa, and NASA, and eventually you just show up for a meeting.
When hiding, don't overhide. Of course this has important parallels for life and poetry. Whatever you are doing, try doing a different amount of it. Make a real effort!
Good. Don't kill yourself and I shall return to encourage you again.
PS Maybe I over-identify but I am presently wearing a tiara, holding my birth certificate, and twirling a gun over my head. Been a hell of a week.