I think that the legal issues are all about where you are. I can take anything I want, unless I plan to sell it, from the gulf here in Panama City. They have no problem as long as it is going in your tank. However, if you are at the state park, you can not take anything... it makes no sense because who is to say I didnt tank it from the state park, then move out into another area of the beach?
On the hermits, I would not put them in my tank until I had a full id on what type they are. They could be harmful to your tank. The same goes for any and every type of animal you might take from the ocean. Let me gie you an example of one of my hard learned experiences:
While snorkling not too long ago I saw this pretty wrasse. I thought he would be cool in my tank, so we caught him. After finally putting him in the tank from the QT
tank we found out that he was not reef safe. He ate everything in our tank that was a plant... Bye bye macro algae. He quickly went back to his ocean home.
We also had some snails that proved to eat entire fish when they were sleeping... it was really cool to watch them devour an entire fish at once, but it was not cool to see the fish die. Have you ever seen a snail wrap its whole body around a fish that is twice its size!?!?! I didnt know it was possible!