What is the specific smoking gun I am supposed to see there?
It's not obvious tho that this is suspicious - there's also a big airport there and it could be just a shipping facility. I guess the argument is that it is an unnecessary detour if it could have gone right to Alexandria.
I'd like to see (a) other CA shipments, say non-computer items, to Alexandria - and whether they go via Dulles and (b) a followup indicating whether Shepard found anything of interest.