ok, the update. I went to the house where i assumed it must be from and they came out with a shotgun.
I got back in my truck and yelled out that I found a missing horse and wondered if it was theirs. they didn't answer, then went back inside so i drove away and fed the horse that night and the next day. then i made signs and put them up at a few places (which isn't easy when you live in the middle of nowhere), plus at the only market in town.
Then a man called and said it's his horse and I asked where he lives. He told me and I said i went there and someone came out with a friggin' shotgun and he said i'm crazy.
oh, your welcome.
then him and a woman drove over with a saddle, saddled him up and she rode off on him. This morning, they brought me 30 bails of hay and a thank you and an apology.