Re that '8647', since the browning pattern is so uneven I'd surmise that the 'activity' was done over several days. Since as rule you can't really stop grass from dying if it's done through 'artificial means', I expect as soon as the forensics guys are done it'll all be dug up and re-sodded.
I'm surprised there's no video of it happening. There are obvs cams on that area, but I suppose they aren't 'night vision'.
It did make me giggle. I