We've had a similar thread on here in the past...some weird stuff spoken of.
For me: 1986, 11th grade, Carroll County, Mississippi. Stalk hunting on a hunting club along the Big Black River swamp. Slipping up to a thicket where I had jumped a really large buck a few weeks prior...my 30-30 in hand and at the ready. As i eased up to and into the thicket I realized there was no deer there that day, then I saw it. Remember that I was just in this exact spot 2 weeks before. Fresh dug rectangular hole, 2-3 feet wide and about 4-5 feet long, maybe 3 feet deep. Shovel stuck into the fresh spoil mound.
The hair on my head and body stood on end. I was at least a mile from the closest road, even furthr to the nearest home. I've never ever run so fast in all my life...even with constantly turing to look behind me as I ran. I went to the sherriff'f office and told them what I found. I had to take them back to the spot. As far as I know they never figured out what was up.
Had about the same thing happen to me. I was scouting way back in the woods on a dim trail. There were 2 rectangle holes side by side. I got out of there in a hurry but didnt even think to tell the police. I went back several months later and couldnt find any signs of them. It had been after a summer and fall after the leaves had fallen.