Unless there's a lot of information we're not seeing here, someone's going to get burned for this. (send me a link and I'll contribute to the kindling fund)
Yes the warranty has to spell out what is to be searched for. But there are at least two issues then. First, was the warrant loosely worded, was the area searched and items taken within that verbiage, and was it illegally loosely worded? and second, officers often have some leeway to take contraband when searching for other things - if they bust down a door for a meth lab warrant, they can take that full auto assault rifle they find in plain sight too, even if it's not on the warrant.
Bigger courts tend to take a very dim view on exposing a reporter's sources. If someone manages to follow the money and tie the target of the whistleblowing to the raid, things will get real exciting. One other thing here, messing with the media's rights tends to get a lot more publicity than messing with Joe Citizen's rights. (they kinda "look after their own") so I hope this gets all the massive media attention it deserves. (it's also much more difficult to muzzle or pay off the media)