I metal detect, and I live in NEW JERSEY..the ass-in-9 laws state the 100 year rule...
SO, If I find a 1911 penny I must pause and call the archy’s to investigate since it is over 100 yrs old..(Yeah right LOL)
In the USA things are still somewhat a free for all. We are not necessarily under penalty of law to reveal anything found on private property.
In the UK they are bound by law to reveal any coin find over 15 in one hole, silver coins, and any gold items. I don’t know all the particulars. In the US private property is generally finders keepers unless you are trespassing, and technically government property is prohibited, although many city parks and beaches are free game for us.
Thats nothing, in Australia you will get into deep dingo poodoo if you find a meteorite and keep it for yourself.
Or worse yet try to take it out of the territory.
My first rule which still stands when I got into MD, I post on several MD forums, I never tell of my discoveries, I actually just say I have not used my GMT. Too many people are way too keen on knowing locations, doesn’t matter if its gold, coins, civil war relics or underground caches.
Sadly thats the downturn of a depressed society, I have to carry concealed when I travel with my MD, its a very hot commodity for thieves.