I have purchased hay that was baled along road medians years ago (before the spraying went crazy). Routinely found trash (cigarette butts, shredded tin cans, plastic bags, snack food bags etc.) in them.
Like Chanda, we once found a whole set of clothes in a round bale that I purchased. Tan twill work pants, a heavy duty denim shirt, over the calf style white socks and BOOTS. No other underclothes. They were all damaged beyond use BUT weren't completely shredded. I wondered what happened to the person who'd been wearing them??
We find more things in hay these days then we did when I was growing up. I attribute it to newer, faster equipment. My biggest worry, when I purchase alfalfa products (including pellets or cubes) is blister beetles. Even dead, the poison in one beetle can kill a whole barn if flakes are "shaken out" and split between horses. This became a problem in the early 80s in CO for a couple of years and also seemed to hit a couple of huge barns in TX at the same time. Blister beetles follow grass hoppers thru Alfalfa hay fields - hay producers that our family knew personally never baled hay after seeing grasshoppers or if they had a grasshopper "infestation"... Seems like a bit of a waste - I can't remember when/if they baled or what they did w/ the hay... Today, I don't personally know any alfalfa hay growers - if I want alfalfa I purchase cubes or pellets.
Marsha - that was GREAT!! We had a witch hit one of our round bales a couple of years ago... Her broomstick and part of her hat were all that remained from "her crash".