Well if they are parked in the driveway they probably have permission. I would then explain ethical hunting to the land owner and let him know that you are finding unrecovered game in the woods, and that you as an ethical hunter thought you should let him know, as it is not something youwant to be associated with or blamed for. Sharing an area with a "hunter" is one thing. A yahoo with a bow and arrow or a gunin his handis another matter. Good luck.

Shane