How much of a stickler are the Game wardens on having verbal permission to hunt on private land from the land owner in the stafford/Fredericksburg area?

I have lived in the NVA area for 3 years but I have always hunted at quantico but this year I want to hunt private land closer to my house. But I haven't been able to find some land owners who own decent size plots with out houses and I was just curious about the consequences of hunting them without verbal permission. The land is not posted.