Actually, we know Hunter broke the law, when he failed to register as a foreign agent and brought foreign business executives to meet with his father. That is all a matter of public record. We know a lot more, but as you say, this thread has run its course.

https://nypost.com/2022/07/23/hunter-biden-almost-certainly-broke-foreign-lobbying-laws-experts/

As for Trump, you don't know if he declassified all the documents found in his home before he left. There is no requirement to make a public record of such. In fact, if a Presidents shares classified information with a third party, that automatically declassifies it.

You might like this link, since it dates back to 2017 and so the current matter was not a factor in the opinion...

https://www.politifact.com/factchecks/2017/may/16/james-risch/does-president-have-ability-declassify-anything-an/