I'm still curious as to what the Flat Earth Society will respond with.
As far as I can tell there has been only one Flat Earther to post and that was junker doing moderator duties.
To be completely honest I'm a little disappointed that my question appears to have been ignored by the society. Maybe I made it sound too official wherein I asked for the society's opinion. I was just generally asking the community at large.
Based off of what I've been told by Buran I guess my answer will be along the lines of space debris but I thought the Flat Earth Society didn't necessarily believe in space. Even if they do, a chunk of random space debris of that size and shape seems to be highly improbable.
For a reference of the shape of the ISS from NASA.
https://goo.gl/images/gT7rkhThe shape from the footage and that of the above image are similar. You can see the shape of the solar panels clearly in the video.
Again I offer my kindest regards.
S.Hunter