Jacko:- I'm staggered! What an intelligent observation!
As you know, you answer your own question. Any source of imagery would be disguised.
What I would suggest is that IF Aurora exists (and I doubt it) it may gather product and data, not in the visual spectrum. Sorry if this sounds obvious.
Doesn't F-117 self designate?
And BTW - has anyone spotted the contradictions in the conceptual idea of HIGH, FAST, LARGE and STEALTHY?