Non posted property you must have verbal permission...You'll get in the same trouble as hunting on posted property without written permission.
You can lose your weapon, vehicle, hunting rights, a fine, and possible jail time. Some of the Wardens can be "richards".
I hunt in the Fairfax/Loudon county area and see these plots all the time. I've seen a 10 and a 12 point for the last 3 weeks at 1:30 in the afternoon every day about 50 yards inside the woods on this small 2 acre plot. They stay right in there and never leave. I wish it was as easy as just going ahead and hunting it to make sure no car gets ruined one evening. But it isn't worth the risk.