Hushmail has handed the feds discs over before. It happened before, it'll happen again.
If you're not a serious person of interest to them them i'd say you have nothing to worry about.
What little people know is that the federal gov. has a criteria they have to meet. This is why its called federal. Do you think they need to pop you to make a controled buy? LOL. They can do that themselves. Get some sleep bro.