I'm in lake county ohio and I can promise you all no one is in my locations
Are you running cameras in these locations? Are you seeing much deer sign(especially bigger tracks or scat)? Do you know if any of your mature deer made it through up till now? They could still be carrying their antlers or someone within a mile or two could be feeding them and drawing them away from your areas. Did you put a lot of early pressure in your areas and maybe bumped them onto other adjacent properties? Do you have a lot of yotes that keep them away? There are just so many variables that come into play regarding deer hunter and shed hunting anymore!
My problem here in the SW is low buck numbers and I can't get into some great looking areas close by to where I have permission for a number of reasons. Mainly, transplanted wealthy LO'ers moving into the country and don't want the hassle of a stranger walking their land(liability or theft risks) which I understand or they have friends or family that also deer and shed hunt.
So far, you are doing better than me as I have just 7 sheds total(5 freshys and 2 year old ones) I've done a shitload of walking so far but feel some might still be carrying!
There's a farm across the road from our subdivision that I've tried to ask for permission 3 times over the last few years. They either wouldn't come to the door or weren't home. A farmer works their fields every year and last spring a side hand helping the farmer picked up a booner set laying in one of the fields. There are many found this way on these huge farms that are owned by corporations and farmers.
Another place that was beside the Beach Water Park looked awesome a few years ago! I never pursued looking into who owned it to walk it but I'm sure the city of Mason or Kings or a developer had some say into it and would not have allowed me but it went into development right after that and a construction worker found a world class non typical set in the 230-250 range! Access,access,access to prime land is all it takes! Land where there's low hunter impact or no gun hunting helps the buck population thrive and with that the genetics and age comes the spoils to those who have access.