Sharing something that is easy way to ensure avoiding storing hot round bales and fire hazards, may help some beginners. Few years ago I took a couple 4 foot, half inch pipes for checking how hot the inside of bales were after felt warm by hand inside barns and I noticed more unusual smells. Kept end cap on one end of pipes for tapping end into bales, the other end made point by angle grinding slits and hammering a point. Tap pipes into end of bales, after 15 min take out pipe and feel for heat. If real warm or too hot to handle in bare hand move that bale away and keep isolated outdoors. I occassionally find a bad bale that may have been a fire risk to barns. You can't tell if bales get hot by just looking at them, and sometimes some bales are not as dry as others