I brought up the same issue last week. Sealed warrants are evidently SOP. Supposedly the warrant is sealed from the public, but not from the defendant or his attorney.
My problem with sealed warrants is, given the level of integrity of judges these days, they are liable to give the JBT's a blank warrant and let them fill it in after they find something they can use and before the defense attorney gets to see it.
Who would know?
Of course the jack-boot lickers will all say that would never happen, and you are a cop-hater for even bringing up the possibility.