If you were as experienced as you claim, you should have known the answers to all the care questions you have been asking, as every one of them is extremely basic care. You do not have to be extremely close to a horse to see gender. You certainly don't have to be close enough to touch them. They should not be fed straw, ESPECIALLY straw that has been left uncovered, as it could be moldy and make them very ill, and if you had spent as much time around horses at these various ranches you say you ride at, you would know that laying down to rest is quite normal. It is very clear from your posts that you know next to nothing about horse care, and have little or no intention of returning these horses to their rightful owner. We are all giving you advice that you asked for, yet don't want to hear, so you chose to ignore it. I truly hope your horse does not suffer for your desire to get three new free horses. Many, many diseases can be carried by horses that show no symptoms. You cannot just look at a horse and tell if it is healthy, and at this point, since you have already put your horse with them, it is too late to do anything should you find out later they are sick. I truly hope, for their sake, that the owner does show up to the sheriffs' office and demand them back.
"Keep a leg on each side and your mind in the middle"