More on the case- they thought the guilty plea would get them off the hook. It hasn’t, yet:
Feds still want Apple to unlock iPhone even after guilty plea
http://www.slashgear.com/feds-still-want-apple-to-unlock-iphone-even-after-guilty-plea-02412475/
The judge is "puzzled" by the DOJ continuing with its demands because the case is essentially over. They no longer have any standing to demand discovery for evidence. The defendant has pled guilty to a lesser charge and they cannot go beck for more. The case just has sentencing left and there is nothing that the data on the phone can provide for that. The evidence is now moot. They have already failed in their first attempt to get what they wanted, now they want to get a precedent with even less valid reasons? Doubt this judge will let them go anywhere. They simply don't have any standing any more.