well, after the little "dragon news conference" they know Surring has gotten a "dragon time out" and is being forced to sit in the corner somewhere... which leaves only a couple great feathered serpents, a few eastern/western dragons (not greats). As the only threats from Amazonia. However, Ghostwalker is not going to be happy that they forced their way back into "his" city.
the other problem is security.. from what I read about Bogota, it's a hellhole.. so security wise it is either madness or genius to hide a few warheads there...
Madness cause the place has been torn apart but what 2 years or fighting? 3? Genius cause it IS so damaged that no one would expect them to be there.
But from what I remember reading there is still a low intensicty ground war with rebels who refuse to surrender.... and getting their hands on such a weapon to use on aazzie troops would be a major coupe.
Now, Aztech may want into Denver bad, but I doubt they would use or store the weapon there while there is still a chance for a diplomacy to carry the day... not to mention the problems with actually using the weapon in a major city (see my above rants)
So I can see it being in the "heart of darkness" until they can force Ghostie to cross into aztlan territory proper, where they can declare a national emergency and then deploy the weapon.
the flip side of that is Dragons are not stupid. Arrogant, prideful? Sure, but not stupid, They are aware of the weapon now. And will be seeking out it's location for destruction.... most likely through runners. (so all the more reason for it to be somewhere they have the best security... )