Is he an illegal alien or not? You think ittakes a trial to establish that? Seriously? You really are trying to avoid that fact aren't you. Why?
He didn't have the money taken because he was illegal, he had the money taken because he didn't declare it. The seizure rules allow you to take people's property without a finding of guilt or a trial on the merits, through a simple declaration with judicial review, like a warrant.
Being illegal, he will be deported. But being illegal had nothing to do with the money being taken from him.
And I've never avoided the fact he is illegal. I'm fine with throwing him out of the country, I simply am one of those who doesn't think we should take all his money away because he is illegal. If there are real criminal charges against him, and those charges lead to fines, I'm fine with making him pay those fines from the money he has. If he didn't pay taxes and owed them, take money for that.
I don't think that a job you take AS an illegal is an illegal job, or that they gains you get are "ill-gotten".