I disagree. In the 2 pictures you show there appears to be 1 person actively looking in the firepit with another (supervisor, no doubt) standing by. At the same moment in the picture on the left there are 16(!) people staring at the oddly shaped hole the photographer is standing over that may be where the orange bag/tarp came from. In the picture on the right there are 7 people standing essentially shoulder to shoulder over that hole. Whatever came out of that hole that is shaped like the orange bag or orange tarp is THE thing going on in these pictures. MOO
I believe they were not concerned about concealing anything from helicopters, planes, or drones because they did not expect to encounter those things in Salem, Idaho. When they realized what was happening they got the No Fly Zone implemented for today.
One thing that bothers me is if that orange thing contains what I fear it contains, why on earth would someone trying to conceal human remains carry them around in or bury them in something blaze orange?