So does that mean that you are going to walk the whole 100 miles? I thought you had a MH. I dont blame you, I would walk or even take a bus, for 12m. Of course I could be wrong, and you meant that you were giving up, and that he could have all the money, instead of just 50%. Thats a great idea, that will really show him who's in charge!
In all seriousness Frankn, you talk as if you are a rich man and dont need this petty cache. Dont just "make one last attempt to contact him", just do it! Why is it so difficult for you to meet this person, face to face? He might not even be getting your mail, or laid up in the hospital, and you are trying to play hard ball. You dont really seem to have much to lose anymore. Some people just dont like e-mails and snail mail, demanding 2/3 of their property! Your not even getting through to most of us here on TN, so however you are explaining your position to him, he may just not get it. Now you seem to be hoping that the cache is not even on his property, but on the neighbors. If it is, dont blow that one too, and play the e-mail scam with him. Just admit that your e-mail game didnt work and now you want only face to face negotiations. The thing to remember is that if you come to a deal with the neighbor, and start digging or exploring, this number one LO will be keeping an eye on what your doing, and if you Dont find anything there, he surely will not let you come back and dig on his land, at any price. That will only convince him that there is no cache, or that the cache is really on his land. At this point, none of any advice given here will work, not even taking him out to a cheap dinner or asking about how his sweet wife is doing. Waiting for conditions to change isnt going to help either, except the conditions for him might improve a lot.
Do you hear me mister LO, I am waiting with detector and shovel, and promise to fill my holes too. (Just joking with you now Frankn, because you already told us that the LO is not the sharpest knife in the drawer, and he would never think of looking on a treasure site, concerning searching for treasure.)