Wouldn't they be easy enough to triangulate quite precisely anyway?
If you know the general area you can probably use public satellite imagery to narrow it down a bit. I suspect there some other clever information you could use to find the locations if you really wanted to.
Even with all the information I'm not sure how feasible it is for any small group to orchestrate a real disruption given how distributed data AWS centers are. Lots of failovers exist and probably a lot people outside AWS know little about.