But the law will force him to prove legal acquisition of everything.
Now, if this was tax court, it would be a whole different thing. Sadly...
I read in the comments for this story elsewhere that antiquities law works like tax court; you must prove that each item was acquired legally with documentation. If so, that law should be changed, imho. Better, get a president who really cares about serious reduction in government so they don’t have the resources to do this crap.