You would know about it, but the warrant can still be sealed if it "is necessitated by a compelling government interest", so you can no idea why it was being do

You would know about it, but the warrant can still be sealed if it "is necessitated by a compelling government interest", so you can no idea why it was being done. In theory you can get this reversed, but it is common for courts to uphold the government's interest in keeping investigations secret well beyond normal disclosure dates, in a few cases even up to and during the trial against the person who was served the warrant.