It works the other way, too.

Years ago a UK bank incorrectly deposited money in my account. My GF’s dad was a lawyer, so I asked him if I could spend it.

“It’s like if someone parks their car in your driveway”, he told me. “While that’s inconvenient, it doesn’t make it your car.”

No, it does not get complicated fast, in fact it's very simple. Selling stolen goods does not take ownership away from the original owner. There's a good write up about this on the Law Stack Exchange site [0].

[0] https://law.stackexchange.com/questions/15869/if-someone-ste...

Ah yes, law. Something arguable and correct and somehow different from the people who happen to be enforcing it.

Pretty soon this is going to be how we separate the generations, people who still believe in imaginary things from the before times.