Tearex, Because Mueller was investigating links between Cohen and the Trump Organization. You forgot to include Cohen's apartment was also a target of the
multiple search warrants. And that like raids are common practice in investigations, and that, Geoffrey Berman, the US Att involved, was a Trump appointee.
"Now remind me. What was the reason for raiding Cohen's office, home, bank security boxes, all computers, and electronic devices?"
It was Plato who said, “He, O men, is the wisest, who like Socrates, knows that his wisdom is in truth worth nothing”