No laws were broken except there is someone with a claim to the funds that can provide proof of that. Even in that situation, it still doesnt break any criminal law I know of

If you have the keys you can spend the coins (no exception). You will struggle to find liquidity from exchanges and will very likely need to provide source of funds when you sell up to a certain amount.

Yes.
Except there is a mafia looking for that money and you do not go announcing it on your local radio, there is no danger.

More like wishful thinking.

- Jay -

Guessing a key is not that easy, and I am not that lucky to guess a key or seed phrase that can unlock me a wallet with $1 billion in it haha. I love to daydream as well, but this one never came to my mind.

But let's just say we did not guess the keys, but we found a wallet with a page attached to it on which the seed phrase is written, and now we have access to a wallet which has $1 billion dollars. So technically I don't own them even if I own the keys and can sign, because on a legal basis I have to prove everything, and if I fail to, then I might not own them, although who would know the wallet is with me? Anyway, there are many possibilities, but I know those funds don't belong to me. So yes, I will try to haaaaaaaaaaaaa, it's hard to say even haha, but I will return haha.

But how can I know who the real owner is?

Coldcard hacker had the seed phrase, so that did not make him the rightful owner, he stole so he is on the run, can be sued legally, so owning keys alone doesn't make you the rightful owner in legal terms.

Well to start with the entropy required to generate a private key is just two random for you to guess out of the blue even if it's where seed phrases it would be almost impossible for that to actually happen. Anyways depending on the kind of country you are in you may not even be able to spend it properly.

However if it was of a dormant address then probably it's a lost one because the chances of an individual Hodling such huge amounts is very slim. Suck kind of amount draws a lot of attention. They could tag it stolen funds and we know how the government handles them obviously.

I dont even think this is even possible. The seedphrase is so difficult that if you dont know it take advantage of wallet you cant have access. If it wee easy for scammers to guess words to have access of wallets,  many wallets would have been compromised and because of this non custodial wallet would have been one not to rely one for security. The seedphrase is so difficult to try that even if some of them are exposed and the others are still hidden it will still be difficult to login.

If the bitcoin belongs to someone and the person said his coin got lost. People will not say he guessed it, they will say he hacked into the wallet and compromised it.

He should report it instead to the authority.

I am not implying he should not try his luck, but he should also think that he can get arrested for it. So he should be able to face the consequences if police arrest the him or her.

How can someone even know or guess someone's bitcoin private key? That is not possible. I totally agree that stealing is stealing. There is nothing it should be called than stealing.

This is not even possible. He stole the bitcoin, simple.

Yes, but people should not make the mistake because the bitcoin sent to a wrong addressay be gone forever. Many people are wicked and see it as opportunity, especially if the money is not up to what the victim can investigate about.

Number 1. Since you have already said it wasn't unlawful then how do you expect it to be against the law, yes the image has created the scene but you actually added to the seen now we have to work with what you added.

Number 2. Since it's lawful and he has access to it certainly there is no restrictions to what he does with it, again I am working with the scene you created.
Honestly for me the other questions are just going to have the same answer because you have already said it is lawful and the person has access.

Well it's technically not a simple task to guess someone's private keys and hopefully you find that kind of amount of funds inside. To me there are two options, which is you either transfer the funds to another wallet, which isn't something I would consider, or you log out of the wallet It is as simple as that best to say  in such scenarios anything can happen because the possibilities are endless. For me, if you are an honest person, you wouldn't take what isn't yours in the first place. Like put yourself in the person's shoes and ask yourself, how would they feel? So yeah it's wrong. Except you want to get involved in looking for the owner, but that shouldn't be your business in the first place even if you say it's a lost wallet, you still wouldn't be able to tell if it's someone's actual wallet or not.so the fact remains,taking funds is still legally considered theft. Even though the system is decentralized, real world property laws still apply. Even if there is no one to judge you, your actions are what matter, and you can choose to do the right thing or the wrong thing. That's all......

A dormant wallet, which seems inaccessible to the owner, keeping aside the possibility of something like this happening, doesn't change why we call it theft. Originally, the Bitcoin doesn't belong to you, whether for any reason or how it became possible, and you gain access to the wallet and plan to take the coin, that's theft, taking what doesn't belong to you, It's you and your conscience.

In all of these circumstances, what concerns the government? Worse of it is reporting the case to the government and handing over the keys.

Technically, if you hold the private key, then you are the owner of those addresses, so the first thing I would do is a sweep.

I am a kind-hearted person and will be returning them if it is in hundred but a billion dollar treasure is no joke and everyone would do the same thing in my opinion.