No complication from my angle, I keep it simple. Here is a question for you; if you asked & they said go ahead & you found a $1000 coin, what would you do?
Well, I'll say it like this: If I've been given permission, with no request to see what I've found, then I'm at no obligation to show them anything. If the owner asks to see what I've found, then i will show them & let things play out from there. The only exception would be if I happened upon some very large cache of gold or silver, or some other extremely significant find that I feel has some sort of archaeological significance (meaning I would feel compelled to let the owner or archaeological community in on the action, for obvious reasons). If I found a $1,000 coin, it would be my first!
I've been a collector of native American artifacts for years (arrowheads, etc.). Some that I've found would exceed the value of that coin 2 or 3 fold to the right collector. If I hadn't searched them out, picked them up, they'd still be out there somewhere of no value to anyone. The value is only realized once the object is discovered and retrieved, correct? Most of the farms, etc I hunt arrowheads on, the farmers could care less about them. If i show them my finds, they just say, "Nice!" & move on.
I would say that most of us are in this hobby with a dual purpose. One, to rediscover artifacts etc lost long ago & preserve them. Two, to get lucky once in a while & make a little profit in the process. I'm not saying you have to be dishonest, but you don't need to go out of your way to remove yourself of any valuables you find either.
I'm currently detecting on a property that used to have a church on it (1874-1897) before it was relocated to it's present location. The property owner is a helluva nice guy. He said it like this: "Anything that was under the ground wasn't doing anyone any good anyway. If you wouldn't have found it, I'd have never known it was there, & no desire to look for it!". So far, I've shown him everything I've found except for yesterday. I went to his house & was going to knock on his door, but saw him napping inside. :-) I chose to let him sleep. I'll show him next time I'm there, which will be soon.
I've got nothing against anyone for detecting the way that they see fit, as long as they fill their holes and try to be courteous. Everyone has their own ideas as to what to do with finds. I don't think any of them are completely wrong, even if I wouldn't choose their path. I don't tolerate trespassing or slovenliness, though. Those are the things that really shine a bright spotlight on the rest of us!