This has happened to me as well. I was 14 when I went on a whitetail hunt on a snow day from school. I shot a doe at dusk with my muzzleloader. I found plenty of blood but decided to wait until the next day to get the deer as I was alone and only had my four wheeler for transportation. when I came back the next day and tracked the deer I had found that at the end of the blood trail the deer had been field dressed and was gone. Later I found some guys the only other ones with permission to hunt the area with my deer in the back of their truck but of course they didn't know anything about that.