Yes the last video was April 9th 2018.It may still be of great value to the owner if there's a way to find him. If he had DJI refresh, he can get a replacement. Does anyone know if you lose a bird during the refresh period, but don't find it until after it expires, can you use it? Is there a date/time on the video?
I did not see it in the video, have you?
Looks like something much bigger than a fishing line. more like a power/phone line for a house, but it looks a bit high tension for that, so maybe just a cable for hauling stuff across the river. A few seconds before the video ends you can see the wooden poles at the left shore as well.