The site is adjacent to a 5 story apartment complex. Right next to a very busy road. I went to the site to check it out and the site is an area constantly full of traffic no matter what time a day. There are hundreds of people in the large apartment complex who would see something by going outside on their balcony, looking out the window, or simply going out to their car. So it isn't a soybean field in the middle of nowhere. It is a soybean field smack dab in the middle of the 4th largest city in Illinois.
Fair enough. My theory is that bystanders ignored a couple of guys in a field. Your theory is that bystanders ignored a rather large alien spaceship, or whatever. I like my theory better.