Use your head man, this means they literally went to a Federal Judge and said "hey we have probable cause that this address is on Coinbase" and the Judge was like "wow that is pretty probable" and then they took the warrant to Coinbase who was like "oh damn that's legit ..... can we squirm out of dealing with this .... no ... oh wow that is our address too, okay here is the private key" and then the FBI transferred it