(a) in the form of a valid court order hand-delivered to and served on your CEO at his home at 6am by two very grim federal agents who don't really like getting up this early, or
(b) if you're represented by counsel, it comes in the form of notification to your attorney by the court clerk that a court order has been issued (or perhaps notification from an AUSA if the clerk's office is slacking).
(a) in the form of a valid court order hand-delivered to and served on your CEO at his home at 6am by two very grim federal agents who don't really like getting up this early, or
(b) if you're represented by counsel, it comes in the form of notification to your attorney by the court clerk that a court order has been issued (or perhaps notification from an AUSA if the clerk's office is slacking).