Gi'day Jim,
First, welcome to the forum! I appreciate your reply, and the other post to Beachguy (Marc). We also have very similar laws as yourself, here in Australia. And though there are a lot of areas that we have access to, to freely detect, it wouldn't take much to have that changed if the laws weren't respected and adhered to. One thing I like from what I understand is that, if any of you find a relic that's of significant value to your government, and if they want that relic, they are prepared to reimburse the finder the value or cost of the relic. Is that correct? So the treasure hunter gets something out of it. Here, it's a different story. If us Aussies find treasure that the government wants, they take it off you, no reimburse whatever for your costs, or the value of the object. As a result, some treasure hunters chose to say nothing of some of their finds. Say I was to find a cache of buried treasure at a beach, then the dilemma I would be in is, do I notify the authorities and let them take it, after all the effort it took for me to find it, with no reimbursement to myself, or do I say nothing, and keep it for myself? I'm talking hypothetically here of course, but it's certainly food for thought.
There was this guy in WA who found a dutch east Indies wreck with many old Spanish treasures on it, fought many court cases to lose. And he lost in a lot of others areas, family breakup, financially, etc. He had spent many years researching and diving to his own cost, to have it all taken away from him. So, you can imagine how wary we become over here. Garry, dived for 18 years, had discovered a shipwreck through much research through old papers, dredging through sand off likely sites. But the marine archaeological society got wind of it, and wanted to put diving restrictions over the area, but could never locate where the wreck was. To this day, Garry knows the exact site of the wreck, but will not tell anyone about it. So it remains hidden in the sand in about 60 feet of water, and as far as he's concerned, that's where it will stay, until the laws change.
Cheers Angela

PS. Dredging for gold is also now banned in the rivers, which is something he loved doing over the years. So it's very important to protect our hobby by, as you've already stated Jim, filling in our holes, leaving nothing for anyone to critise us over.