I think I'd just tell him it's the last winter of free wood. It's a getting a little late, to put anybody on the spot, for something survival related. Who knows, maybe he'll have a whole lot of time this winter, to re-think the hunting situation. I don't think it would bother me much. to give up the more common stuff, and something that isn't in real good shape, but I dug up something in fine condition, or really odd or unusual, I'd want to keep it. Buttons and bullets just don't seem all that exciting to me. I get, that there different types, and have different meanings, and value.
Most people should already have all the wood they expect to need for the winter. Would think he's counting on that wood. Losing a hunting spot kind of sucks, maybe a friendship, but taking away something he really needs in the winter, is much worse.