I thought this was a pretty obscure post - how does it get moved up in the queue so fast!
The one I saw was also silent.
If I had not already been looking up, I would've not seen it.

I believe it had 7 lights (One at each corner, and two up each leading edge). A starlight quality, except all very uniform.
It was extremely fast and traversed the entire sky in just under 2.5 secs. It seemed to level out and just disappear. Poof.

The thing seemed to be made out of flat black "screen door" looking material and mimic the night sky behind it. It was huge.