From the AGFC website "A hunter is liable for a baiting violation if he or she knows, or reasonably should know, that the area is or has been baited, even following complete removal of bait."
"There is no set distance from a baited site that a hunter may shoot a turkey. If the wildlife officer deems the bait is aiding the hunter in harvesting a turkey, the hunter can be cited for a violation."
It sounds like it will depend on the judge and how well you can argue that it was reasonable for you not to know the corn was there. It sounds like it comes down to would a reasonable person have checked the feeder when they first saw it? Or, on this particular lease, would a reasonable person have expected it to be inactive. Good luck, I can see it going either way unfortunately.