I agree with Scarlet Dew, Leave the note, it allows the neighbor to contact you.

Brew, what happens when you leave a note for the neighbor on YOUR property? Is he trespassing if he finds it?

I personally don't hunt property lines(determined by the weapon used), if I can shoot across the property line then I am too close. I expect the same from my neighbors.

What I do allow and encourage is that if a neighbor shoots a deer and it comes on my property...... come and get the deer then call me. I don't want a deer to go to waste because of spoilage or coyotes while you are trying to contact me. I catch you on my property without a blood trail you will be prosecuted!