To add to Rob's point; raiding anyone's private records without a good reason is risky enough already, if the warrant was wrongly granted it can cause every scrap of evidence gathered due to the warrant to be removed from the case.
The judiciary does not appreciate shenanigans intruding on the privacy of the average citizen, and intruding on confidential matters like attorney-client privilege, doctor-patient confidentiality and religious confessions spoken to a priest in trust are not done lightly. Doing so with someone with influence and connections is more dangerous still. Doing it with the guy in charge of the executive branch of the government or his immediate supporting staff? Career suicide at best if you are wrong. That the FBI raided three different locations only tells us that they are certain Cohen had access to and/or kept the records somewhere, but that they did not necessarily know where.
The judiciary does not appreciate shenanigans intruding on the privacy of the average citizen, and intruding on confidential matters like attorney-client privilege, doctor-patient confidentiality and religious confessions spoken to a priest in trust are not done lightly. Doing so with someone with influence and connections is more dangerous still. Doing it with the guy in charge of the executive branch of the government or his immediate supporting staff? Career suicide at best if you are wrong. That the FBI raided three different locations only tells us that they are certain Cohen had access to and/or kept the records somewhere, but that they did not necessarily know where.