I hate you feel like you got cheated, but its doubtful there are 10 mature bucks are staying on a 120 acres, food plots or not. Once the bachelor groups break up you may have a handfull at best. Add in the rut and it all depends on how many does you have in heat at any given moment. Plus you said the food plots were gone. I dont know your property, but there may be no reason for a deer to be there now??? Six gun hunters on 120 acres, plus however many bowhunters and no food sounds like a recipe for a bad opener to me.
Regardless, if you KNOW your neighbors are breaking the law I would have the DNR investigate. If you are unsure, I would think hard about making enemies over a percieved injustice.