Holy Crap, now Tnet is doing How To on counter intel and counter sv.
Well now that you have screwed the pooch and posted this on a treasure hunting site about a person of interest you know is at least second generation interested, perhaps it is time to stop.
Ignore and do not attempt to employ anything mentioned on here; you know really nothing about the fella or his mates, and for all you know if you try something on the wrong person they may react with their emotions, or worse they sniff you out long before your coming and decide to play back. I know I would play back, and make it appear that you have the upper hand, drag it out for months on end, long enough for you to noticeably change your behaviour, play with your emotions, allow you to think at times you get the upper hand and then frustrate you at other times, then bait you in more, get you really comfortable. By then you will likely violate some civil rights or worse, but also you created a paper trail here, yes that can still be recovered from your machine, folks close to you will be able to say they have noticed some major changes in your life, odd changes. Then I would hang you out to dry.
You ever stop to consider that perhaps this old fella who had a father search around for this has seen you around areas of interest because he spent that time with his father there and he is just revisiting them old days in person. Maybe he was only trying to help you out.
But good luck to you, keep us all posted on here as events transpire, its part of your treasure hunting story now.