UFO Sighting by two 5th graders - large square shape, erratic movements, in evening sky above Price Utah

My son and his friend were riding bikes near the local Church. My son's friend said: Look at that! It's like a big square darting around. They were really excited, and chased on their bikes, trying to a good shot and try to video. They stopped and snapped a photo then my son called me excited at 7:17 from the friends phone to report what they saw. The friend sent me a photo, and I was so shocked to see it. I asked my son to draw the movements of the craft, and asked his friend to also draw a diagram of how the craft moved. The friend also sent me a. video from his phone as well as a close up photo.
I have not included the friends name or contact, but advised the parent that they will likely receive a call, possibly from Mr. Davenport, as I did today. I had called on the hotline last night and left a message. The friend recalled that it may have shifted color from dark purple to black. He doesn't think it made any sound but wasn't sure. During my questioning for this report, the friend said that a helicopter had passed overhead a couple of minutes before the sighting. It was headed west to east. As I am uploading, I see that the video type is not allowed on your site.