I think you will know immediately when you find a current one. You can tell it was done by their claws, like mini rake marks. Also if the ground is soft enough look for at least a partial track, I usually can pick them out but our ground is pretty sandy here so a track shows up real easy. I read that it's easy to be fooled by possums because they do the same but that a possum will only scratch (rake) in one direction where as turkeys scratch in all directions. Maybe some of the experienced folks here can verify that.